Hash value extraction in order to obey gelf specs (only strings and numbers are allowed in v1.1), see http://graylog2.org/gelf#specs
Updated gelf output, deprecated fields are now optional, extract values from array
deprecate old gelf methods
Merge remote-tracking branch 'upstream/master'
fix comma before space in array join for gelf output
Merge pull request #797 from runningman84/master

Hash value extraction in order to obey gelf specs