Instead of differentiating between trimmed chats and minimized chats, the two
are now combined into the same thing.

This commit contains some initial work, but functionality is still impaired.

of any existing ones, but left of the control box.

* Make sure that a restored (grown) chat is inserted to the right
* Make sure restoring via the contacts roster works

More flesh on the view and superview for trimmed chats.
Add event handlers.
Renamed some methods to make them shorter, more consistent.

Added a view for trimmed chat boxes and a super-view for keeping track of them.

https://github.com/IronSummitMedia/startbootstrap/tree/master/templates/grayscale

moment.js is accurate to the second, instead of milliseconds. This causes
timing errors while testing.