Pulled out Server API into the NetServer base class, and a few minor changes to get the NetClient API to work well with the WiFly library

Author: amcewen

Server.h

@@ -1,19 +1,19 @@
 #ifndef server_h
 #define server_h
 
-#include "Print.h"
+#include "NetServer.h"
 
 class Client;
 
 class Server : 
-public Print {
+public NetServer {
 private:
   uint16_t _port;
   void accept();
 public:
   Server(uint16_t);
   Client available();
-  void begin();
+  virtual void begin();
   virtual void write(uint8_t);
   virtual void write(const char *str);
   virtual void write(const uint8_t *buf, size_t size);