Implement RFC3164 formatting for syslog message; Implement UDP writer.

src/UDPWriter.h

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+/*
+ The MIT License (MIT)
+
+Copyright (c) 2015 Marko Živanović
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+ */
+
+#ifndef UDPWRITER_H
+#define	UDPWRITER_H
+
+#include <memory>
+#include <boost/asio.hpp>
+#include "Writer.h"
+
+class UDPWriter : public Writer {
+public:
+
+    UDPWriter(const std::string&, const int);
+
+    virtual void sendMessage(std::shared_ptr<SyslogMessage>);
+
+private:
+    const std::string& _destination;
+    const int _port;
+    boost::asio::io_service _ios;
+    boost::asio::ip::udp::socket _socket{_ios};
+};
+
+#endif	/* UDPWRITER_H */
+