@message was missing in event, added 'Message' field to @message.
Added message_format attribute to nagios_nsca output
Made documentation consistent with other outputs that provide message_format such as pipe.
Merge pull request #462 from jonathanq/nagios_nsca_changes

Added message_format to nagios_nsca plugin
Merge pull request #429 from drogerschariot/master

Added @message to eventlog input