Restore avatar frames in collaborative mode
Don't blink remote carets in collab mode

The caret should not blink by default. The local caret will blink once
focus is set to the window (or restored during setup).
Merge pull request #349 from peitschie/collab-cursor-fixes

Fixes to caret & avatar in collab mode
Always blur focus from the event trap before updating content editable

Toggling the content editable flag while the element is in focus will
sometimes stop the browser from allowing the IME to be activated.
Blurring the focus and then restoring ensures the browser re-evaluates
the IME state after the content editable flag has been updated.
Correct subscription to the blur event

The blur event should always be on the event trap, as the event should
indicate when the local input is no longer active.
Merge pull request #347 from peitschie/ime-activation-fix

Always blur focus from the event trap before updating content editable
Ensure caret is destroyed when corresponding cursor is removed

When a cursor is removed from the document, the associated caret should
also be destroyed. This prevents stale timers from attempting to update
the style on detached nodes, which causes crashes in some browsers
(e.g., WebKit in Cocoa on OSX10.8).