Upgrading rails to 3.2.11

Fixes #79
Restored some deleted CSS to bring back black nav bar

Simplify nav bar to not try to do anything 'responsive' (for now)

Fixes #76
Remove extra <br /> from devise forms to make labels more clear

Fixes #75
Remove extra table header from event index when logged out
An event can now have many sessions, instead of just one.
Date field on events replaced by event_sessions table.
Merge branch 'event_sessions_cleaner' of git://github.com/jesses16/bridge_troll into jesses16-event_sessions_cleaner