EthernetGateway added. Removed usage of string class i Gateway code (reduced program memroy by 2k). FIxed potential problem in Dallas sensor example sketch.

libraries/UIPEthernet/utility/uip_debug.h

@@ -0,0 +1,18 @@
+#ifndef UIP_DEBUG_H
+#define UIP_DEBUG_H
+extern "C" {
+  #import "utility/uip.h"
+}
+
+class UIPDebug {
+
+public:
+
+  static void uip_debug_printconns();
+  static bool uip_debug_printcon(struct uip_conn *lhs,struct uip_conn *rhs);
+  static void uip_debug_printbytes(const uint8_t *data, uint8_t len);
+
+};
+
+
+#endif