Revert "Break another gem file deadlock"

This reverts commit cde0f4c5f49da9c4b45694fe0f0bfb41e7b08964.
Revert "Check in spring binstubs"

This reverts commit 69415e1a02be063aa9ff481c9c2633841f25fa6e.
Revert "Upgrade to Ruby 2.1.1/Rails 3.2.17"

This reverts commit 283813de59297934ca51847a4fb79620f141935b.
Update various dependencies

- Wire up Spring
- Teabag -> Teaspoon
- No more Guard or better_errors
- Lock to Cmsimple and mercury-rails
Bring in rails_12factor for production
Upgrade Rails to 3.2.17
Update landing page copy