Update the changelog with all the 0.2.1 changes that have thus far been merged into the 0.2.x branch.
Update the changelog with all the 0.2.1 changes that have thus far been merged into the 0.2.x branch.

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