Remove dmg_background.png
Remove dmg_background.png

The bdist_dmg function was removed, so this file is no longer needed
joergdietrich/astropy,mhvk/astropy,StuartLittlefair/astropy,stargaser/astropy,MSeifert04/astropy,bsipocz/astropy,astropy/astropy,saimn/astropy,mhvk/astropy,DougBurke/astropy,joergdietrich/astropy,kelle/astropy,saimn/astropy,lpsinger/astropy,StuartLittlefair/astropy,DougBurke/astropy,larrybradley/astropy,pllim/astropy,bsipocz/astropy,MSeifert04/astropy,astropy/astropy,MSeifert04/astropy,kelle/astropy,AustereCuriosity/astropy,dhomeier/astropy,tbabej/astropy,kelle/astropy,tbabej/astropy,pllim/astropy,pllim/astropy,funbaker/astropy,funbaker/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,kelle/astropy,joergdietrich/astropy,stargaser/astropy,AustereCuriosity/astropy,astropy/astropy,AustereCuriosity/astropy,larrybradley/astropy,DougBurke/astropy,funbaker/astropy,saimn/astropy,lpsinger/astropy,dhomeier/astropy,larrybradley/astropy,pllim/astropy,bsipocz/astropy,aleksandr-bakanov/astropy,larrybradley/astropy,astropy/astropy,AustereCuriosity/astropy,aleksandr-bakanov/astropy,mhvk/astropy,lpsinger/astropy,joergdietrich/astropy,saimn/astropy,tbabej/astropy,bsipocz/astropy,astropy/astropy,stargaser/astropy,StuartLittlefair/astropy,MSeifert04/astropy,larrybradley/astropy,funbaker/astropy,mhvk/astropy,dhomeier/astropy,pllim/astropy,aleksandr-bakanov/astropy,saimn/astropy,AustereCuriosity/astropy,tbabej/astropy,stargaser/astropy,joergdietrich/astropy,lpsinger/astropy,lpsinger/astropy,aleksandr-bakanov/astropy,tbabej/astropy,kelle/astropy,mhvk/astropy,dhomeier/astropy,dhomeier/astropy,DougBurke/astropy