clarify ruby 1.9 fixes in comments
clarify ruby 1.9 fixes in comments

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