Upgrade rails to 4.2.0
Fix a deprecated configuration option
Upgrade coffee-rails to 4.1.0
Upgrade jbuilder to 2.2.6
Upgrade sass-rails to 5.0.0
Upgrade uglifier to 2.6.0
Upgrade rdoc to 4.2.0
Upgrade jquery-rails to 4.0.2
Upgrade rubocop to 0.28.0