cleaning up travis yml file and adding in 3.5 and 3.6
cleaning up travis yml file and adding in 3.5 and 3.6

bretthandrews/marvin,sdss/marvin,albireox/marvin,bretthandrews/marvin,albireox/marvin,bretthandrews/marvin,albireox/marvin,sdss/marvin,sdss/marvin,albireox/marvin,sdss/marvin,bretthandrews/marvin