added details on installing ipython
added details on installing ipython
albireox/marvin,sdss/marvin,bretthandrews/marvin,sdss/marvin,bretthandrews/marvin,sdss/marvin,albireox/marvin,sdss/marvin,bretthandrews/marvin,albireox/marvin,bretthandrews/marvin,albireox/marvin