Can't know whether existing roster item is already shown under the existing group.

But other user is not online to quickly subscribe back.

Conflicts:
	converse.js

Assignment to writable property `style.height` instead of readonly `offsetHeight`.

Fixes #196.

Make sure contact's chat_status attr is saved.

Updates #175

Make sure contact's chat_status attr is saved.

Updates #175

Made sure that the non-group usecase is still covered.

This fix breaks compatibility with IE8

* Call refreshWebkit hack when opening a chat room
* New event emitted when a chat room is opened.

updates #123