Minor additions to the extending documentation
Patch to extract the embedded GeoIP dat file, to a tempfile, by default.
Added mention of unsupported status to plugin_status check
filters/geoip: fixing the file handle from read the dat from the jar.
Makefile: make the monolithic jar PHONY, so it builds everytime for the
          jar target
Grok documentation updates

* Added mention of grok data type conversions
* Minor docs cleanup
Merge pull request #313 from jamtur01/extendocs

Minor additions to the extending documentation
Merge pull request #326 from vbatts/PHONY-jar

Makefile: make the monolithic jar PHONY, so it builds everytime for the jar target
Merge pull request #325 from vbatts/LOGSTASH-734

Work around JRUBY-7052 (LOGSTASH-734) fixing the geoip database embedded in the jar.
Merge pull request #327 from jamtur01/grokdoc

Grok documentation updates
Allow configuration of whether the grok filter tags events on failure
Update contributors
Include changelog entry
Merge pull request #328 from neilprosser/master

Allow us to configure whether the grok filter tags on failure
- don't include backtraces
- reduce date perf test requirements for now since they're failling
  intermittently on jenkins.
- jrubyc target java 5 again (since without it, and compiled under jdk7,
  you get jdk7-only class files)