remove capistrano from the main source code repo

capistrano deployment scripts will be maintained in a separate deployment repo
Merge pull request #4116 from Raven24/remove-capistrano

remove capistrano from the main source code repo
Fix typo in devise initializer
bump chunky_png
bump guard
bump rake
bump mime-types
bump oauth2
bump safe_yaml
bump omniauth-twitter
bump client_side_validations
bump faraday
bump rspec-mocks
bump selenium-webdriver
bump haml
bump omniauth
bump foreigner
bump cucumber
bump fog
bump hike