Support "change:text" event on Text widget

Fix #167

Change-Id: I53460e2ddafbf10de443d187e5cbc7424d036e93
Sample app with collection view and remote data

Provide a sample app that loads data from reddit and displays it as a
list. Creates a detail page on touch of an element.

Change-Id: I1d8b875f75b1019b21e5a6e02287b36f509f1915