Create PEAR System_Daemon handler

[System_Daemon](http://pear.php.net/package/System_Daemon) is an very stable package to work with daemons in PHP. It already handles logs by itself this pull request aims to integrate System_Daemon and Monolog.
A default formatter was created, since System_Daemon already prefix the date and level to the log message there is no need to duplicate this information, SystemDaemonFormatter is based on LineFormatter but has only channel, message, context and extras.