Travis build: drop go1.1, add go1.2, go1.3 and go1.4
Travis build: drop go1.1, add go1.2, go1.3 and go1.4

go-gorp/gorp,evenco/gorp,cortex/gorp,kimxilxyong/gorp,cortex/gorp,go-gorp/gorp,mousesun/gorp,gabelula/gorp,GeertJohan/gorp,kimxilxyong/gorp,kevinc0825/gorm,losinggeneration/gorp,mousesun/gorp,GeertJohan/gorp,gabelula/gorp,kevinc0825/gorm,yp-engineering/gorp,losinggeneration/gorp,yp-engineering/gorp,evenco/gorp