Add radian_is_dimensionless function to equivalencies.py
Add radian_is_dimensionless function to equivalencies.py

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