Port everything to class framework

The last patch in the sequence. Every place that was previously
setting prototype has been ported to Lang.Class, to make code more
concise and allow for better toString().

https://bugzilla.gnome.org/show_bug.cgi?id=664436

js/ui/contactDisplay.js

@@ -20,11 +20,9 @@ function launchContact(id) {
 
 
 /* This class represents a shown contact search result in the overview */
-function Contact(id) {
-    this._init(id);
-}
+const Contact = new Lang.Class({
+    Name: 'Contact',
 
-Contact.prototype = {
     _init: function(id) {
         this._contactSys = Shell.ContactSystem.get_default();
         this.individual = this._contactSys.get_individual(id);
@@ -131,7 +129,7 @@ Contact.prototype = {
             return tc.load_icon_name(null, 'avatar-default', St.IconType.FULLCOLOR, size);
         }
     },
-};
+});
 
 
 /* Searches for and returns contacts */