Tidied up coordinate helpers
Tidied up coordinate helpers

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