Added support for IETF 5425 syslog parsing in grok.
Changes wrt. @jordansissel's comments on [my pull request](https://github.com/logstash/logstash/pull/415).
Merge pull request #415 from adesso-mobile/master

Grok support for IETF 5424 syslog parsing
Meh. Forgot one variable...
And another one :-( Working in the eve is a **bad** idea.
Merge pull request #416 from adesso-mobile/master

IETF syslog grok fixes :-(
- don't differentiate owner/contributor
- swap 'the bomb' for 'awesome'