added entry for Galactocentric frame
added entry for Galactocentric frame

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