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/tests/perl/udpclient.pl

@@ -0,0 +1,26 @@
+#!/usr/bin/perl
+#udpclient.pl
+
+use IO::Socket::INET;
+
+# flush after every write
+$| = 1;
+
+my ($socket,$data);
+
+#  We call IO::Socket::INET->new() to create the UDP Socket
+# and bind with the PeerAddr.
+$socket = new IO::Socket::INET (
+PeerAddr   => '192.168.0.6:5000',
+Proto        => 'udp'
+) or die "ERROR in Socket Creation : $!\n";
+#send operation
+$data = "data from client";
+$socket->send($data);
+
+#read operation
+$data = <$socket>;
+print "Data received from socket : $data\n ";
+
+sleep(10);
+$socket->close();