Dancer logger engine for Sys::Syslog

This module implements a logger engine that sends log messages to syslog,
through the Sys::Syslog module.

The setting __logger__ should be set to `syslog` in order to use this session
engine in a Dancer application.

You can also specify the other configuration via the 'syslog' config key, e.g.

    syslog:
      facility: 'local0'
      ident: 'my_app'