Add go-proxyproto dependencies

vendor/github.com/armon/go-proxyproto/README.md

@@ -0,0 +1,36 @@
+# proxyproto
+
+This library provides the `proxyproto` package which can be used for servers
+listening behind HAProxy of Amazon ELB load balancers. Those load balancers
+support the use of a proxy protocol (http://haproxy.1wt.eu/download/1.5/doc/proxy-protocol.txt),
+which provides a simple mechansim for the server to get the address of the client
+instead of the load balancer.
+
+This library provides both a net.Listener and net.Conn implementation that
+can be used to handle situation in which you may be using the proxy protocol.
+Only proxy protocol version 1, the human-readable form, is understood.
+
+The only caveat is that we check for the "PROXY " prefix to determine if the protocol
+is being used. If that string may occur as part of your input, then it is ambiguous
+if the protocol is being used and you may have problems.
+
+# Documentation
+
+Full documentation can be found [here](http://godoc.org/github.com/armon/go-proxyproto).
+
+# Examples
+
+Using the library is very simple:
+
+```
+
+// Create a listener
+list, err := net.Listen("tcp", "...")
+
+// Wrap listener in a proxyproto listener
+proxyList := &proxyproto.Listener{Listener: list}
+conn, err :=proxyList.Accept()
+
+...
+```
+