Upgraded bootstrap css and js to 3.1.1
Updated bootswatch themes and added 2 new ones.
Removing superhero.  I want to like it but it just looks too ugly for now.
Added lumen to stylesheets
Updated css to work with bootstrap 3.1.1
Changing default theme to lumen because I like it so much (at least for now)
Merge branch 'feature/update-to-bootstrap-3.1' into develop
Date/time string on chat messages now formatted in a more human friendly way
Refactored database calls to the Message model instead of doing the DB calls direct from the controller.
Added line to update the timezone in read me.
Changed default template back to yeti.
Merge branch 'release/v1.1'