HTML validation fixes

Correcting HTML errors to try to get IE out of quirks mode.
LCL event info for homepage
Merge branch 'content' of github.com:drewww/unhangout into content
Fix remaining index page validation errors
Fixes for IE9+10, warning for <10
Sanitize user models when transmitting to clients
Auto-expire HoA's, use session/trash paradigm

Allow HoA sessions to auto-expire their hangout URL in the same way that
regular sessions do.  Add a "trash" button similar to the one used on
regular sessions.