feature/button_label_binding

Bindings do not work along with the handlebar helpers, I need to do <code>{{Tent.Button labelBinding="controller.someLabel"}}</code> as the <code>someLabel</code> property changes the <code>Tent.Button</code> label changes to the new value, but the change doesn't reflect on the UI, I did some research & found out that it is because of having handlebar helpers, without them the bindings work, also we need localization so using a computed property for that