- add check to ensure jruby is being used at build time.   I'll later make this use the custom jruby built here, but   for now just make sure 'ruby' is jruby so bundler installs   gems correctly.
- add check to ensure jruby is being used at build time.
  I'll later make this use the custom jruby built here, but
  for now just make sure 'ruby' is jruby so bundler installs
  gems correctly.

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