Adding R support to rainbow builder.
Adding R support to rainbow builder.

greyhwndz/rainbow,linuxl0ver/rainbow,cybrox/rainbow,javipepe/rainbow,HotelsDotCom/rainbow,ccampbell/rainbow,ptigas/rainbow,ptigas/rainbow,jeremykenedy/rainbow,greyhwndz/rainbow,metasyn/rainbow,cybrox/rainbow,cybrox/rainbow,linuxl0ver/rainbow,metasyn/rainbow,jeremykenedy/rainbow,segmentio/rainbow,javipepe/rainbow,jeremykenedy/rainbow,ccampbell/rainbow,HotelsDotCom/rainbow,greyhwndz/rainbow,linuxl0ver/rainbow,metasyn/rainbow,segmentio/rainbow,javipepe/rainbow,HotelsDotCom/rainbow