Bump Rails version to 3.2.18 for security fixes.

For CVE-2014-0130
Merge pull request #691 from dylanahsmith/rails-security-fix

Bump Rails version to 3.2.18 for security fixes.
Remove debugger and ruby-debug from Gemfile

Those gems are specific to ruby version, and only used when debugging the app, so they dont need to be installed everytime
Some cleaning and standardising.
Added deploy notifications.
Refactored so no method missing.