Add `strong_parameters`, fix devise for it
Fix `decent_exposure` to work with `strong_parameters`
Replace airbrake with rollbar
Merge branch 'master' into replace-airbrake-with-rollbar

* master:
  Remove travis CI configuration file.
Remove airbrake initializer and add new one for rollbar
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
Use devise from master.
Remove any guard stuff.
Remove assets group
Install gems to .bundle
Update config files
Update brakeman to 2.1.0
Use 1.9 hash syntax
Update jquery-rails to 3.0.4
Introduce bin/server
Use sendgrid only if ENV['SENDGRID_USERNAME'] exists