new filter: response code.  translate http response codes to text
replaced responsecode.rb with new hotness,  translate.rb
Update lib/logstash/filters/translate.rb

fixed comments being for older version of the filter.
incorporated feedback from pull request
Merge pull request #335 from paulczar/master

new filter 'translate'
First pass at ua-parser filter.

This filter integrates the user_agent_parser gem to allow parsing
of User-Agent strings in to structured data. This can be used for
real-time analytics or other interesting things from your web server
logs.
Allow updating the regexes.yaml out of band.

Add configuration to allow using a regexes.yaml other than the
one shipped in user_agent_parser. Updated files can be found at
https://github.com/tobie/ua-parser