updated the segmentsWidget to throw a message whenever it's clicked to indicate
where the arrowWidget should position itself.
IriSP.ArrowWidget = function(Popcorn, config, Serializer) {
IriSP.Widget.call(this, Popcorn, config, Serializer);
};
IriSP.ArrowWidget.prototype = new IriSP.Widget();
IriSP.ArrowWidget.prototype.clear = function() {
};
IriSP.ArrowWidget.prototype.clearWidget = function() {
};
IriSP.ArrowWidget.prototype.draw = function() {
var templ = Mustache.to_html(IriSP.arrowWidget_template, {});
this.selector.append(templ);
};