Make list view compatible with default Ember.Array and ArrayController

The list view code can almost be used without needing all the Ember extending in main.js.

For my project, I needed to use it on its own, and one simple change made it compatible with the standard Ember Array and ArrayController. I realize most use cases will utilize emberella's main.js and all its extensions, but might as well allow it to support the default and be more versatile.