diff -r 192ce5938726 -r 02e3c464223f client/js/models.js
--- a/client/js/models.js	Thu Jun 23 17:50:37 2016 +0200
+++ b/client/js/models.js	Fri Jun 24 13:07:21 2016 +0200
@@ -1,19 +1,20 @@
 (function(root) {
-    "use strict";
+    'use strict';
 
     var Backbone = root.Backbone;
 
     var Models = root.Rkns.Models = {};
 
     Models.getUID = function(obj) {
-        var guid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g,
-                function(c) {
-                    var r = Math.random() * 16 | 0, v = c === 'x' ? r
-                            : (r & 0x3 | 0x8);
-                    return v.toString(16);
-                });
+        var guid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'
+            .replace(/[xy]/g,
+                     function(c) {
+                         var r = Math.random() * 16 | 0, v = c === 'x' ? r
+                             : (r & 0x3 | 0x8);
+                         return v.toString(16);
+                     });
         if (typeof obj !== 'undefined') {
-            return obj.type + "-" + guid;
+            return obj.type + '-' + guid;
         }
         else {
             return guid;
@@ -21,16 +22,16 @@
     };
 
     var RenkanModel = Backbone.RelationalModel.extend({
-        idAttribute : "_id",
+        idAttribute : '_id',
         constructor : function(options) {
 
-            if (typeof options !== "undefined") {
+            if (typeof options !== 'undefined') {
                 options._id = options._id || options.id || Models.getUID(this);
-                options.title = options.title || "";
-                options.description = options.description || "";
-                options.uri = options.uri || "";
+                options.title = options.title || '';
+                options.description = options.description || '';
+                options.uri = options.uri || '';
 
-                if (typeof this.prepare === "function") {
+                if (typeof this.prepare === 'function') {
                     options = this.prepare(options);
                 }
             }
@@ -38,13 +39,13 @@
         },
         validate : function() {
             if (!this.type) {
-                return "object has no type";
+                return 'object has no type';
             }
         },
         addReference : function(_options, _propName, _list, _id, _default) {
             var _element = _list.get(_id);
-            if (typeof _element === "undefined" &&
-                typeof _default !== "undefined") {
+            if (typeof _element === 'undefined' &&
+                typeof _default !== 'undefined') {
                 _options[_propName] = _default;
             }
             else {
@@ -55,115 +56,115 @@
 
     // USER
     var User = Models.User = RenkanModel.extend({
-        type : "user",
+        type : 'user',
         prepare : function(options) {
-            options.color = options.color || "#666666";
+            options.color = options.color || '#666666';
             return options;
         },
         toJSON : function() {
             return {
-                _id : this.get("_id"),
-                title : this.get("title"),
-                uri : this.get("uri"),
-                description : this.get("description"),
-                color : this.get("color")
+                _id : this.get('_id'),
+                title : this.get('title'),
+                uri : this.get('uri'),
+                description : this.get('description'),
+                color : this.get('color')
             };
         }
     });
 
     // NODE
     var Node = Models.Node = RenkanModel.extend({
-        type : "node",
+        type : 'node',
         relations : [ {
             type : Backbone.HasOne,
-            key : "created_by",
+            key : 'created_by',
             relatedModel : User
         } ],
         prepare : function(options) {
             var project = options.project;
-            this.addReference(options, "created_by", project.get("users"),
-                    options.created_by, project.current_user);
-            options.description = options.description || "";
+            this.addReference(options, 'created_by', project.get('users'),
+                              options.created_by, project.current_user);
+            options.description = options.description || '';
             return options;
         },
         toJSON : function() {
             return {
-                _id : this.get("_id"),
-                title : this.get("title"),
-                uri : this.get("uri"),
-                description : this.get("description"),
-                position : this.get("position"),
-                image : this.get("image"),
-                style : this.get("style"),
-                created_by : this.get("created_by") ? this.get("created_by")
-                        .get("_id") : null,
-                size : this.get("size"),
-                clip_path : this.get("clip_path"),
-                shape : this.get("shape"),  
-                type : this.get("type")
+                _id : this.get('_id'),
+                title : this.get('title'),
+                uri : this.get('uri'),
+                description : this.get('description'),
+                position : this.get('position'),
+                image : this.get('image'),
+                style : this.get('style'),
+                created_by : this.get('created_by') ? this.get('created_by')
+                    .get('_id') : null,
+                size : this.get('size'),
+                clip_path : this.get('clip_path'),
+                shape : this.get('shape'),
+                type : this.get('type')
             };
         }
     });
 
     // EDGE
     var Edge = Models.Edge = RenkanModel.extend({
-        type : "edge",
+        type : 'edge',
         relations : [ {
             type : Backbone.HasOne,
-            key : "created_by",
+            key : 'created_by',
             relatedModel : User
         }, {
             type : Backbone.HasOne,
-            key : "from",
+            key : 'from',
             relatedModel : Node
         }, {
             type : Backbone.HasOne,
-            key : "to",
+            key : 'to',
             relatedModel : Node
         } ],
         prepare : function(options) {
             var project = options.project;
-            this.addReference(options, "created_by", project.get("users"),
-                    options.created_by, project.current_user);
-            this.addReference(options, "from", project.get("nodes"),
-                    options.from);
-            this.addReference(options, "to", project.get("nodes"), options.to);
+            this.addReference(options, 'created_by', project.get('users'),
+                              options.created_by, project.current_user);
+            this.addReference(options, 'from', project.get('nodes'),
+                              options.from);
+            this.addReference(options, 'to', project.get('nodes'), options.to);
             return options;
         },
         toJSON : function() {
             return {
-                _id : this.get("_id"),
-                title : this.get("title"),
-                uri : this.get("uri"),
-                description : this.get("description"),
-                from : this.get("from") ? this.get("from").get("_id") : null,
-                to : this.get("to") ? this.get("to").get("_id") : null,
-                style : this.get("style"),
-                created_by : this.get("created_by") ? this.get("created_by")
-                        .get("_id") : null
+                _id : this.get('_id'),
+                title : this.get('title'),
+                uri : this.get('uri'),
+                description : this.get('description'),
+                from : this.get('from') ? this.get('from').get('_id') : null,
+                to : this.get('to') ? this.get('to').get('_id') : null,
+                style : this.get('style'),
+                created_by : this.get('created_by') ? this.get('created_by')
+                    .get('_id') : null
             };
         }
     });
 
     // View
     var View = Models.View = RenkanModel.extend({
-        type : "view",
+        type : 'view',
         relations : [ {
             type : Backbone.HasOne,
-            key : "created_by",
+            key : 'created_by',
             relatedModel : User
         } ],
         prepare : function(options) {
             var project = options.project;
-            this.addReference(options, "created_by", project.get("users"),
-                    options.created_by, project.current_user);
-            options.description = options.description || "";
-            if (typeof options.offset !== "undefined") {
+            this.addReference(options, 'created_by', project.get('users'),
+                              options.created_by, project.current_user);
+            options.description = options.description || '';
+            if (typeof options.offset !== 'undefined') {
                 var offset = {};
                 if (Array.isArray(options.offset)) {
                     offset.x = options.offset[0];
                     offset.y = options.offset.length > 1 ? options.offset[1]
-                            : options.offset[0];
+                        : options.offset[0];
                 }
                 else if (options.offset.x != null) {
                     offset.x = options.offset.x;
@@ -175,27 +176,27 @@
         },
         toJSON : function() {
             return {
-                _id : this.get("_id"),
-                zoom_level : this.get("zoom_level"),
-                offset : this.get("offset"),
-                title : this.get("title"),
-                description : this.get("description"),
-                created_by : this.get("created_by") ? this.get("created_by")
-                        .get("_id") : null,
-                hidden_nodes: this.get("hidden_nodes")
-            // Don't need project id
+                _id : this.get('_id'),
+                zoom_level : this.get('zoom_level'),
+                offset : this.get('offset'),
+                title : this.get('title'),
+                description : this.get('description'),
+                created_by : this.get('created_by') ? this.get('created_by')
+                    .get('_id') : null,
+                hidden_nodes: this.get('hidden_nodes')
+                // Don't need project id
             };
         }
     });
 
     // PROJECT
     var Project = Models.Project = RenkanModel.extend({
-        schema_version : "2",
-        type : "project",
+        schema_version : '2',
+        type : 'project',
         blacklist : [ 'saveStatus', 'loadingStatus'],
         relations : [ {
             type : Backbone.HasMany,
-            key : "users",
+            key : 'users',
             relatedModel : User,
             reverseRelation : {
                 key : 'project',
@@ -203,7 +204,7 @@
             }
         }, {
             type : Backbone.HasMany,
-            key : "nodes",
+            key : 'nodes',
             relatedModel : Node,
             reverseRelation : {
                 key : 'project',
@@ -211,7 +212,7 @@
             }
         }, {
             type : Backbone.HasMany,
-            key : "edges",
+            key : 'edges',
             relatedModel : Edge,
             reverseRelation : {
                 key : 'project',
@@ -219,7 +220,7 @@
             }
         }, {
             type : Backbone.HasMany,
-            key : "views",
+            key : 'views',
             relatedModel : View,
             reverseRelation : {
                 key : 'project',
@@ -229,19 +230,19 @@
         addUser : function(_props, _options) {
             _props.project = this;
             var _user = User.findOrCreate(_props);
-            this.get("users").push(_user, _options);
+            this.get('users').push(_user, _options);
             return _user;
         },
         addNode : function(_props, _options) {
             _props.project = this;
             var _node = Node.findOrCreate(_props);
-            this.get("nodes").push(_node, _options);
+            this.get('nodes').push(_node, _options);
             return _node;
         },
         addEdge : function(_props, _options) {
             _props.project = this;
             var _edge = Edge.findOrCreate(_props);
-            this.get("edges").push(_edge, _options);
+            this.get('edges').push(_edge, _options);
             return _edge;
         },
         addView : function(_props, _options) {
@@ -249,57 +250,57 @@
             // TODO: check if need to replace with create only
             var _view = View.findOrCreate(_props);
             // TODO: Should we remember only one view?
-            this.get("views").push(_view, _options);
+            this.get('views').push(_view, _options);
             return _view;
         },
         removeNode : function(_model) {
-            this.get("nodes").remove(_model);
+            this.get('nodes').remove(_model);
         },
         removeEdge : function(_model) {
-            this.get("edges").remove(_model);
+            this.get('edges').remove(_model);
         },
         validate : function(options) {
             var _project = this;
             _.each(
-              [].concat(options.users, options.nodes, options.edges,options.views),
-              function(_item) {
-                if (_item) {
-                    _item.project = _project;
+                [].concat(options.users, options.nodes, options.edges,options.views),
+                function(_item) {
+                    if (_item) {
+                        _item.project = _project;
+                    }
                 }
-              }
             );
         },
         getSchemaVersion : function(data) {
-          var t = data;
-          if(typeof(t) === "undefined") {
-            t = this;
-          }
-          var version = t.schema_version;
-          if(!version) {
-            return 1;
-          }
-          else {
-            return version;
-          }
+            var t = data;
+            if(typeof(t) === 'undefined') {
+                t = this;
+            }
+            var version = t.schema_version;
+            if(!version) {
+                return 1;
+            }
+            else {
+                return version;
+            }
         },
         // Add event handler to remove edges when a node is removed
         initialize : function() {
             var _this = this;
-            this.on("remove:nodes", function(_node) {
-                _this.get("edges").remove(
-                        _this.get("edges").filter(
-                                function(_edge) {
-                                    return _edge.get("from") === _node ||
-                                           _edge.get("to") === _node;
-                                }));
+            this.on('remove:nodes', function(_node) {
+                _this.get('edges').remove(
+                    _this.get('edges').filter(
+                        function(_edge) {
+                            return _edge.get('from') === _node ||
+                                _edge.get('to') === _node;
+                        }));
             });
         },
         toJSON : function() {
             var json = _.clone(this.attributes);
             for ( var attr in json) {
                 if ((json[attr] instanceof Backbone.Model) ||
-                        (json[attr] instanceof Backbone.Collection) ||
-                        (json[attr] instanceof RenkanModel)) {
+                    (json[attr] instanceof Backbone.Collection) ||
+                    (json[attr] instanceof RenkanModel)) {
                     json[attr] = json[attr].toJSON();
                 }
             }
@@ -308,53 +309,53 @@
     });
 
     var RosterUser = Models.RosterUser = Backbone.Model
-            .extend({
-                type : "roster_user",
-                idAttribute : "_id",
+        .extend({
+            type : 'roster_user',
+            idAttribute : '_id',
 
-                constructor : function(options) {
+            constructor : function(options) {
 
-                    if (typeof options !== "undefined") {
-                        options._id = options._id ||
-                            options.id ||
-                            Models.getUID(this);
-                        options.title = options.title || "(untitled " + this.type + ")";
-                        options.description = options.description || "";
-                        options.uri = options.uri || "";
-                        options.project = options.project || null;
-                        options.site_id = options.site_id || 0;
+                if (typeof options !== 'undefined') {
+                    options._id = options._id ||
+                        options.id ||
+                        Models.getUID(this);
+                    options.title = options.title || '(untitled ' + this.type + ')';
+                    options.description = options.description || '';
+                    options.uri = options.uri || '';
+                    options.project = options.project || null;
+                    options.site_id = options.site_id || 0;
 
-                        if (typeof this.prepare === "function") {
-                            options = this.prepare(options);
-                        }
+                    if (typeof this.prepare === 'function') {
+                        options = this.prepare(options);
                     }
-                    Backbone.Model.prototype.constructor.call(this, options);
-                },
+                }
+                Backbone.Model.prototype.constructor.call(this, options);
+            },
 
-                validate : function() {
-                    if (!this.type) {
-                        return "object has no type";
-                    }
-                },
+            validate : function() {
+                if (!this.type) {
+                    return 'object has no type';
+                }
+            },
 
-                prepare : function(options) {
-                    options.color = options.color || "#666666";
-                    return options;
-                },
+            prepare : function(options) {
+                options.color = options.color || '#666666';
+                return options;
+            },
 
-                toJSON : function() {
-                    return {
-                        _id : this.get("_id"),
-                        title : this.get("title"),
-                        uri : this.get("uri"),
-                        description : this.get("description"),
-                        color : this.get("color"),
-                        project : (this.get("project") != null) ? this.get(
-                                "project").get("id") : null,
-                        site_id : this.get("site_id")
-                    };
-                }
-            });
+            toJSON : function() {
+                return {
+                    _id : this.get('_id'),
+                    title : this.get('title'),
+                    uri : this.get('uri'),
+                    description : this.get('description'),
+                    color : this.get('color'),
+                    project : (this.get('project') != null) ? this.get(
+                        'project').get('id') : null,
+                    site_id : this.get('site_id')
+                };
+            }
+        });
 
     var UsersList = Models.UsersList = Backbone.Collection.extend({
         model : RosterUser