Test against py34 on travis
Test against py34 on travis

maximkulkin/marshmallow,jmcarp/marshmallow,daniloakamine/marshmallow,0xDCA/marshmallow,Tim-Erwin/marshmallow,xLegoz/marshmallow,etataurov/marshmallow,bartaelterman/marshmallow,0xDCA/marshmallow,dwieeb/marshmallow,VladimirPal/marshmallow,marshmallow-code/marshmallow,jmcarp/marshmallow,Bachmann1234/marshmallow,quxiaolong1504/marshmallow,mwstobo/marshmallow