Merge pull request #40 from cthielen/master

Add MessageLog for high-level tracking of send status. Minor code cleanup.
Gem update
Removed extra files in /assets that were generated by scaffolding
Fixed error: 'Can't mass-assign protected attributes: created_at_in_words, recipient_count, send_status'
Deleted unused rm models
Removed unused controller actions
Removed unused actions in the messages controller
Cleaned up and created more tests
Hiding empty fields in message show view
Brought back update action in messageController
Collapse show view if visible when archiving a message
Brought back recipients index action, and created its associated test
Merged branch 'cleanup'
Upgrade Rails to 3.2.15
Collapse show view if visible when deleting a message
Fixes #41: RSS title includes classification and date
Removed false 'No active messages' in the RSS feed when there are no messages
Hide the navbar in the message#show screen
Enable Passenger support and disable Unicorn
Capistrano optimization: deploy:migrations -> deploy:migrate