Filter vendor packages from tests

.travis.yml

@@ -11,6 +11,6 @@ go:
 sudo: false
 script:
   - go build -v ./...
-  - go test -v ./...
+  - go list ./... |grep -v vendor/ |xargs go test
   - gofmt -d $(find -type f -name '*.go' -not -path './vendor/*')
   - go list ./... |grep -v vendor/ |xargs go vet