added docstrings
added docstrings

astropy/astropy,DougBurke/astropy,saimn/astropy,kelle/astropy,saimn/astropy,tbabej/astropy,astropy/astropy,dhomeier/astropy,aleksandr-bakanov/astropy,larrybradley/astropy,StuartLittlefair/astropy,AustereCuriosity/astropy,pllim/astropy,MSeifert04/astropy,bsipocz/astropy,MSeifert04/astropy,mhvk/astropy,AustereCuriosity/astropy,joergdietrich/astropy,mhvk/astropy,larrybradley/astropy,saimn/astropy,DougBurke/astropy,funbaker/astropy,AustereCuriosity/astropy,tbabej/astropy,stargaser/astropy,StuartLittlefair/astropy,saimn/astropy,joergdietrich/astropy,bsipocz/astropy,lpsinger/astropy,bsipocz/astropy,DougBurke/astropy,larrybradley/astropy,kelle/astropy,dhomeier/astropy,astropy/astropy,funbaker/astropy,larrybradley/astropy,lpsinger/astropy,DougBurke/astropy,larrybradley/astropy,aleksandr-bakanov/astropy,funbaker/astropy,funbaker/astropy,astropy/astropy,StuartLittlefair/astropy,AustereCuriosity/astropy,pllim/astropy,AustereCuriosity/astropy,joergdietrich/astropy,mhvk/astropy,tbabej/astropy,pllim/astropy,tbabej/astropy,joergdietrich/astropy,stargaser/astropy,lpsinger/astropy,aleksandr-bakanov/astropy,dhomeier/astropy,StuartLittlefair/astropy,joergdietrich/astropy,pllim/astropy,pllim/astropy,dhomeier/astropy,lpsinger/astropy,saimn/astropy,aleksandr-bakanov/astropy,dhomeier/astropy,MSeifert04/astropy,mhvk/astropy,bsipocz/astropy,kelle/astropy,StuartLittlefair/astropy,MSeifert04/astropy,kelle/astropy,kelle/astropy,stargaser/astropy,mhvk/astropy,tbabej/astropy,astropy/astropy,stargaser/astropy,lpsinger/astropy