Fixing travis for 3.1 builds
Fixing travis for 3.1 builds

mandrew/silverstripe-subsites,danaenz/silverstripe-subsites,wernerkrauss/silverstripe-subsites,danaenz/silverstripe-subsites,silverstripe/silverstripe-subsites,mikenz/silverstripe-simplesubsites,silverstripe/silverstripe-subsites,mandrew/silverstripe-subsites,mikenz/silverstripe-simplesubsites,wernerkrauss/silverstripe-subsites