Update gem factory_girl_rails, to v.4.3.0.
Update gem uglifier, to v.2.3.1.
Update gem email_spec, to v.1.5.0.
Update gem database_cleaner, to v.1.2.0.
Update gem ruby_parser, to v.3.2.2.
Update gem mail_form, to v.1.5.0.
Update gem pry-rails, to v.0.3.2.
Update gem select2-rails, to v.3.5.1.
Avoid rescuing from Exception.

+ See http://stackoverflow.com/q/10048173/356895
Add gem exception_notification, v.4.0.1.
Enable ExceptionNotification for production environment.