add alternative tags on grokparsefailure
@message was missing in event, added 'Message' field to @message.
- SINCEDB_PATH is no longer.
- note the rename
- all tests passing; docs look OK. Ship it.
- link to flatjar
- fix one more path
sleep on every N'th event
add hooks for after filter
Allow appname and procid to be format strings.

Handy if your Logstash agent is parsing from multiple application
sources to send to a single syslog instance.
filter to prune fields from events
corrected some rspec tests desciptions
support for fields with array values
Plugins need to have a plugin_status set

Added comment & line for plugin_status
- mark date on release
Refactor Hash.fetch usage to provide default values

Rather than explicitly running through if/else blocks, it's easier to
read if the default value is provided against the Hash method calls directly.
No need to store fetched values in local variables; use directly

These fetched values are easier to read when placed directly into the
Hash that they're going to be used in. No need for the temporary
variables to be used and means more of the class can be viewed at a time.
Riemann now supports arbitrary key value pairs
Some minor clarifications of the docs
- debug load() calls with DEBUG=require, too