Added CompositeStretch and ContrastBias stretch
Added CompositeStretch and ContrastBias stretch

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