Self containment of JS controller forms toolbars

[amazeika]

Right now the JS controller only allows for a single controller on the page. This is because the JS looks for some components page wide by using a generic selector, e.g. (.k-toolbar while searching for the toolbar component).

This is of course a direct problem if you want to have more than one controller instance running in the same page since you may end up picking up components from a different JS controller.