adds jupyter notebook to introduce new features in v2.1
adds jupyter notebook to introduce new features in v2.1

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