trigger sort on users collection for all sortworthy changes
fixes #91
assign presence_id in messages collection
remove presence_id code from users collection
update presence colors
fixes #92
update demo link
Add SoundCloud embed to messages
Merge pull request #96 from dannytatom/soundcloud

Add SoundCloud embed to messages
make embedded images and thumbnails smaller
slight adjustments to soundcloud inline code
Update readme to reflect current state of SoundCloud embeddedness
better handle the elimination of channel models on part
fixes #95
ensure that channels aren't joined twice on reconnect
fixes #68