Cleaner UpstreamProxyConfig, added package README

psiphon/upstreamproxy/README.md

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+`upstreamproxy` Package
+=======================
+
+This provides upstream proxy support by extending golang.org/x/net/proxy package.
+
+Currently supported protocols:
+* SOCKS4 via `socks4a` URI scheme
+* SOCKS5 via `socks5` URI scheme
+* HTTP with Basic Auth via `http` URI scheme
+
+# Usage
+
+```
+var proxyDialer psiphon.Dialer 
+proxyDialer = NewProxyDialFunc((
+            ForwardDialFunc: psiphon.NewTCPDialer(tcpDialerConfig),
+            ProxyURIString: "http://user:password@proxyhost:8080"
+            })
+```
+
+
+