Added SyslogUdpHandler.

This handler lets you log to a remote syslogd server via UPD. The
use-case here is having many webservers, and the need to gather log-
files on a centralized server.

tests/Monolog/Handler/UdpSocketTest.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Monolog\Handler;
+
+use Monolog\TestCase;
+
+class UdpSocketTest extends TestCase
+{
+    public function testWeDoNotSplitShortMessages()
+    {
+        $socket = $this->getMock('\Monolog\Handler\SyslogUdp\UdpSocket', ['send'], ['lol', 'lol']);
+
+        $socket->expects($this->at(0))
+            ->method('send')
+            ->with("HEADER: The quick brown fox jumps over the lazy dog");
+
+        $socket->write("The quick brown fox jumps over the lazy dog", "HEADER: ");
+    }
+
+    public function testWeSplitLongMessages()
+    {
+        $socket = $this->getMock('\Monolog\Handler\SyslogUdp\UdpSocket', ['send'], ['lol', 'lol']);
+
+        $socket->expects($this->at(1))
+            ->method('send')
+            ->with("The quick brown fox jumps over the lazy dog");
+
+        $aStringOfLength2048 = str_repeat("derp", 2048/4);
+
+        $socket->write($aStringOfLength2048."The quick brown fox jumps over the lazy dog");
+    }
+
+    public function testAllSplitMessagesHasAHeader()
+    {
+        $socket = $this->getMock('\Monolog\Handler\SyslogUdp\UdpSocket', ['send'], ['lol', 'lol']);
+
+        $socket->expects($this->exactly(5))
+            ->method('send')
+            ->with($this->stringStartsWith("HEADER"));
+
+        $aStringOfLength8192 = str_repeat("derp", 2048);
+
+        $socket->write($aStringOfLength8192, "HEADER");
+    }
+}