don't install wheels for egg_info case (closes #948)
don't install wheels for egg_info case (closes #948)

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