Upgrade Nokogiri, XML-smart
Update rake
Upgrade Celluloid
Updated mysql and slim
Update sass, coffee-script and uglifier
Updated exception_notification
Updated Devise
Updated guard - may not work as before
Updated rspec
Updated factory_girl
db cleaner
cucumber
Don't set encryptor, it just generates warning

https://github.com/plataformatec/devise/blob/72cf2481b503bbdcc36f101823545680af81b1a9/lib/devise.rb#L227
Capistrano
Remove newrelic

If someone wants to use newrelic then they can set it up on their own
fork. No need to keep it here.
Merge branch 'update-gems' into dev

Update most of the gems to their latest versions.