Initial delivery of metrics code (#81)

* Initial delivery of metrics code

* Fix build issues

* Fix build issue with go vet

vendor/github.com/prometheus/common/config/testdata/server.key

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
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++juVKz+S8ufFmVvmIXkyDcpyy/26VLC6esy8dV0JoWc4EeitoJvQD1JVZ5+CBTY+
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+syFbkVyMq+KtM3lUez5O4c5wfJUOsPnXSOlISxhD8qHy23C/GdvNPcGrGNc2kKjE
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+9dux7LbIFeOoJmoDTWG2+fI=
+-----END PRIVATE KEY-----