Automatically disable scroll when we have scrolled up in the chat window, and automatically re-enable it when we are scrolled back to the bottom.
Merge pull request #326 from melissanoelle/feature/autodisable_scroll

Autodisable Scroll
Add lolex to test suite to fix newly failing tests

This used to be a part of Sinon, but it has been extracted to a separate package
return the contact status on update roster template render object