feature req: syslog handler

lots of systems still rely heavily on syslog, it'd be really good for there to be a syslog aware handler. some features I'd like to see in a hypothetical handler:

- automatically sends the correct log level
- lets you specify the syslog facility and app name
- defaults to a local socket connection, with a fallback to 127.0.0.1, but allows specifying a remote server
- understands not to break log output across multiple lines, defaults to escaping newline characters in output