adding possibility to update the informations of a book (title, etc.) and handle 'idBook' parameters in Slide urls to send back only the slides of a book (will replace BooksSlides)
<div class="modal-header ng-scope">
<h3 class="modal-title">Authentication Page</h3>
</div>
<form ng-submit="login()">
<div class="modal-body ng-scope">
<input type="text" class="form-control" ng-model='username' placeholder="Username">
<input type="password" class="form-control" ng-model='password' placeholder="Password">
</div>
<div class="modal-footer ng-scope">
<a href='' ng-click="register()">Creer un compte</a>
<button type="button" ng-click="cancel()" class="btn btn-warning">Cancel</button>
<button type="submit" ng-disabled="userForm.$invalid" class="btn btn-primary">Login</button>
</div>
</form>