WebSocketTransport Constructor (#195)

The focus of these changes is to change the access scope of the
`WebSocketTransport` constructor from `internal` to `public` to mirror
that of the other transport types.

Microsoft.Azure.Amqp/Amqp/Transport/WebSocketTransport.cs

@@ -30,7 +30,7 @@ public override string RemoteEndPoint
             }
         }
 
-        internal WebSocketTransport(WebSocket webSocket, Uri uri)
+        public WebSocketTransport(WebSocket webSocket, Uri uri)
             : base(WebSocketTransportSettings.WebSockets)
         {
             this.webSocket = webSocket;