added exact versions to requirements.txt
added exact versions to requirements.txt

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