Merge pull request #1 from untergeek/untergeek_contrib

Prepare for core/contrib tarball release.
Remove contrib notice, it is not needed. Documentation generator will handle that.
Porting back PR 1081 from logstash repository

See https://github.com/logstash/logstash/pull/1081 for history.
Taking into account comments from @electrical, PR4
Fixing indent (PR 4)
Merge pull request #4 from pmauduit/master

Adding filters for WxS requests (Porting back PR 1081 from official logstash repository)
Merge branch 'master' of https://github.com/elasticsearch/logstash-contrib

# By Pierre Mauduit (3) and Jordan Sissel (1)
# Via Jordan Sissel (1) and others
* 'master' of https://github.com/elasticsearch/logstash-contrib:
  Fixing indent (PR 4)
  Taking into account comments from @electrical, PR4
  Porting back PR 1081 from logstash repository
  Remove contrib notice, it is not needed. Documentation generator will handle that.

Conflicts:
	lib/logstash/filters/json.rb