Add Ruby version to Gemfile
Alphabetize existing gems
Add assets group to Gemfile
Add Rails to Gemfile
Add Postgres to Gemfile
Replace Formtastic with Simple Form
Add jQuery to Gemfile
Add Strong Parameters to Gemfile
Remove Flutie

* Remove Paperclip.
* Specify minimum version of Rails.
* Use Capybara Webkit.
* Specify minimum version of Capybara Webkit.