Add default values for all Ellipse2D model input parameters.
Add default values for all Ellipse2D model input parameters.

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