Update to Rails 4.2.0
Replace deprecated `config.serve_static_assets`
Update scripts and configuration for Rails 4.2
Update to Ruby 2.2.0
Update jquery-cdn dependency to 2.1.3
Update rails_serve_static_assets dependency to 0.0.3
Update execjs dependency to 2.2.2
Update netrc dependency to 0.10.2
Update tins dependency to 1.3.3