Adding write(str) and write(buf, size) methods to Print class and Ethernet library Client and Server classes. This allows sending a whole string or buffer at once, reducing the number of ethernet packets.

hardware/libraries/Ethernet/Server.h

@@ -18,6 +18,8 @@ public:
   Client available();
   void begin();
   virtual void write(uint8_t);
+  virtual void write(const char *str);
+  virtual void write(const uint8_t *buf, size_t size);
 };
 
 #endif