Add Gruntfile for running tests
Add Gruntfile for running tests

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