creating a session now switches to new tab

Ignore-this: 45698866e17b049c716eab9daf625cf2

When a user creates a new session, they will be switched to the new tab automatically.
However, if another user initiates the session, they will not switch.

darcs-hash:20130331053100-c21fe-51198c57338b82d552cb939391eeb7db1aeb229d
fixed bug in the "quit session" message

Ignore-this: 8f9a5688e3ad32c4acd982429dcfe7ed

Fixed a bug where the "quit session" message would appear in all sessions the user is
in, instead of just the one they quit

darcs-hash:20130331053216-c21fe-43b26c4c0c9bb3cce224f3da4ee6024e6a269a75