set default_codec doc attribute 

[skip ci] update gemspec summary 

version bump for some docs fixes 

bump patch level for doc generation 

update logstash-core-plugin-api dependency and bump to 3.0.0 (#11) 

dependency logstash-core-plugin-api ~> 1.0 

dependency logstash-core >= 2.0.0.beta2 < 3.0.0 

dependency logstash-core >= 2.0.0.snapshot < 3.0.0 

bump version 

Remove traces and references the meta logstash gem and change it to u… …se the new logstash-core gem.