- Allow dynamic strings for facility and level. - Level now supports strings (INFO, I) case-insensitive, in addition to   the old numbers (0-7)
- Allow dynamic strings for facility and level.
- Level now supports strings (INFO, I) case-insensitive, in addition to
  the old numbers (0-7)

  Resolves LOGSTASH-83

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