Upgrade Rails => 3.2.17, rails_admin, misc dependencies.

Upgraded Rails to 3.2.17 - - latest version supported on bamboo stack. Also updated dependencies to the minimum required to get app functioning. Goal was to make changes as few and as small as possible. Tests all pass and app runs. Please see attached terminal screenshots and staging here: http://gentle-thicket-9182.herokuapp.com/ . 

Please note that due to asset precompilation and not wanting to disturb /public/assets in the name of keeping the PR small, /people won't load in staging. Repairing this issue is a matter of deleting the public/assets folder so heroku will recompile assets and allow the page to load. Cedar stack also wants you to include the rails_12factor gem but again, the goal was to keep the PR as small as possible. It will cooperate without the gem, but they are verbose when insisting you get it.

See logs:
![precompile](https://f.cloud.github.com/assets/5808881/2508201/c442469e-b3d0-11e3-9b05-ea644ed82cb6.png)

 Tests Pass!
![rails3 2](https://f.cloud.github.com/assets/5808881/2507834/0e97bbf2-b3c7-11e3-8f3a-f648aa2e5c17.png)

Updated PR to include stack command screenshot:
![stack](https://f.cloud.github.com/assets/5808881/2508083/9e74202a-b3cd-11e3-91c5-9faa38ebd225.png)

Updated PR to include bash prompt from heroku app displaying versioning:
![heroku](https://f.cloud.github.com/assets/5808881/2508110/7e85b930-b3ce-11e3-9bd0-72408413606a.png)