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.
Added documentation for SyslogUdpHandler
['foo' => 'bar'] array notation is not PHP 5.3 compatible.
Inline _write method
Removed more ['foo' => 'bar'] array notation
Merge remote-tracking branch 'nulpunkt/master'
Combine common syslog handlers functionality, refs #258