Add GroupedTable to the top-level table classes
Add GroupedTable to the top-level table classes

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