added warning about coordinates being WIP
added warning about coordinates being WIP

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