Temporarily allow numpy 1.13 rc failures
Temporarily allow numpy 1.13 rc failures

Until upstream problems are resolved.

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