added proper epoch propogation to matrix transforms
added proper epoch propogation to matrix transforms

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