Help needed: vendor files for Prometheus support

These are the vendor files needed for Prometheus support.
I have not been able to figure out how to do this properly with gopkg.

vendor/github.com/prometheus/client_golang/.travis.yml

@@ -0,0 +1,10 @@
+sudo: false
+language: go
+
+go:
+ - 1.7.x
+ - 1.8.x
+ - 1.9.x
+
+script:
+ - go test -short ./...