Removed a left-over `copy`, an unneeded import, and some PEP8 fixes
Removed a left-over `copy`, an unneeded import, and some PEP8 fixes

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