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/keyboard.js

@@ -61,11 +61,9 @@ const CaribouKeyboardIface = <interface name='org.gnome.Caribou.Keyboard'>
 <property name='Name' access='read' type='s' />
 </interface>;
 
-function Key() {
-    this._init.apply(this, arguments);
-}
+const Key = new Lang.Class({
+    Name: 'Key',
 
-Key.prototype = {
     _init : function(key) {
         this._key = key;
 
@@ -191,13 +189,12 @@ Key.prototype = {
             this._boxPointer.hide(true);
         }
     }
-};
+});
 
-function Keyboard() {
-    this._init.apply(this, arguments);
-}
+const Keyboard = new Lang.Class({
+    // HACK: we can't set Name, because it collides with Name dbus property
+    // Name: 'Keyboard',
 
-Keyboard.prototype = {
     _init: function () {
         this._impl = Gio.DBusExportedObject.wrapJSObject(CaribouKeyboardIface, this);
         this._impl.export(Gio.DBus.session, '/org/gnome/Caribou/Keyboard');
@@ -532,7 +529,7 @@ Keyboard.prototype = {
     get Name() {
         return 'gnome-shell';
     }
-};
+});
 
 const KeyboardSource = new Lang.Class({
     Name: 'KeyboardSource',