Upgrade to Rails 3.2.10

 - there was a SQL injection bug in 3.2.8
 - also fixed the version of therubyracer, to avoid dependency on native
   v8.
 - we need therubyracer to build bootstrap stuff.
Fix version of Twitter bootstrap to avoid dependency hell.

Bootstrap 2.1.9 depends on therubyracer 0.11 which depends on native v8
which requires root access.
and now rails 3.2.11 because of another security patch
Switched from WebRick to thin for a couple of reasons

- webrick spits out spurious warnings when serving assets
- heroku recomments thin, and we're working on using heroku a bit
Merge pull request #81 from Skud/upgrade_rails

Upgrade rails