Add `strong_parameters`, fix devise for it
Fix `decent_exposure` to work with `strong_parameters`
Upgrade to Rails4 + Ruby 2.0
Update rails_best_practices config, rempve old scripts
Merge `flatstack:rails-4` branch
Update bullet config; update database.yml.example to work with pg; update bin/ci to run feature tests
Fix features and add parameter sanitizer for User
Merge pull request #92 from timurkhafizov/upgrade-to-rails4

[WIP] Upgrade to rails4