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/golang/protobuf/.gitignore

@@ -0,0 +1,16 @@
+.DS_Store
+*.[568ao]
+*.ao
+*.so
+*.pyc
+._*
+.nfs.*
+[568a].out
+*~
+*.orig
+core
+_obj
+_test
+_testmain.go
+protoc-gen-go/testdata/multi/*.pb.go
+_conformance/_conformance