add functions/vendor files

vendor/github.com/cactus/go-statsd-client/statsd/doc.go

@@ -0,0 +1,29 @@
+// Copyright (c) 2012-2016 Eli Janssen
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
+/*
+Package statsd provides a StatsD client implementation that is safe for
+concurrent use by multiple goroutines and for efficiency can be created and
+reused.
+
+Example usage:
+
+	// first create a client
+	client, err := statsd.NewClient("127.0.0.1:8125", "test-client")
+	// handle any errors
+	if err != nil {
+		log.Fatal(err)
+	}
+	// make sure to clean up
+	defer client.Close()
+
+	// Send a stat
+	err = client.Inc("stat1", 42, 1.0)
+	// handle any errors
+	if err != nil {
+		log.Printf("Error sending metric: %+v", err)
+	}
+
+*/
+package statsd