- add 'bug' error class for  more obvious things where we can notify the user that code is using APIs that no longer exist, etc.
- add 'bug' error class for  more obvious things where we can notify the
user that code is using APIs that no longer exist, etc.

Aloomaio/logstash-kafka,Aloomaio/logstash-kafka,tinglinux/logstash-kafka,joekiller/logstash-kafka,joekiller/logstash-kafka,opentable/logstash-kafka,tinglinux/logstash-kafka,opentable/logstash-kafka