Test rake against ruby 2.2 and head
Test rake against ruby 2.2 and head

jaustinhughey/rake,envato/rake,utilum/rake,ipmobiletech/rake,ruby/rake,pjump/rake,88rabbit/rake,envato/rake,askl56/rake,tmornini/rake,Vanzct/rake,taiganakagawa/rake,ruby/rake,zzak/rake,esasse/rake,codedogfish/rake,bentley/rake