adds colorbar utils from mangadap repo
adds colorbar utils from mangadap repo

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