Return true on ItemSelectionSupport.click

Playing with this and ember.js today. I "noticed" that routes
wouldn't change. So if I had a route of "foobar" it wouldn't
transition to that view.

I have very little JS skill and about a days worth of ember.js. So I am not sure of any other side affects of this change. I was using the 1.0.0-rc.1 version of ember.js.