Reenable rvm fuzzy matching in travis
Reenable rvm fuzzy matching in travis

And exclude 2.2 OSX build until travis-ci/travis-ci#3885 fixed.

saisai/byebug,guilherme/byebug,k0kubun/byebug,ozydingo/byebug,miamiruby/byebug,os97673/byebug,k0kubun/byebug,miamiruby/byebug,scalp42/byebug,deivid-rodriguez/byebug,icebreaker/byebug,webdev1001/byebug,icebreaker/byebug,scalp42/byebug,ozydingo/byebug,yui-knk/byebug,k0kubun/byebug,webdev1001/byebug,yui-knk/byebug,deivid-rodriguez/byebug,saisai/byebug,guilherme/byebug,os97673/byebug,yui-knk/byebug,guilherme/byebug,deivid-rodriguez/byebug