Move meta merging into _vstack (for now)
Move meta merging into _vstack (for now)

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