feat(chat): Switch to one-way data binding for most of the bindings which should improve performance as chat log gets large.
fix(chat): Eliminate need for $apply for slash commands that print local only.

Moved /users command to server side. This also helped performance because the user list wasn't needed to be sent to the client on every update.

resolves #3
Merge branch 'master' of https://github.com/NiXXeD/chat