Created symlink for /var/lib/logstash/logstash.jar

The puppet manifests expect it here. If you'd prefer that, i could also change it in the puppet manifests.
add sort filter
filters: date: add target option

Update the date filter to support a target option.  If defined,
instead of updating the @timestamp field, update the given target field.
This is useful for events that have multiple timestamps (e.g., start and
end times).
Restore class method from_json, as event is no more an included class
Repair outputs/file test + add use of zcat command to cover LOGSTASH-997
Merge pull request #545 from jbochi/master

Add clear_interval and flush_interval options for metrics filter
Merge pull request #633 from wiibaa/spec-output-file

Correct test case spec/output/file.rb
Add contributors and changes for recent pull requests.
Added make update
- improve conversion of oldlogstashjson (@source_host -> host, etc)
- use 'text' instead of 'line' (which is overwritten by Cabin at
loglevel debug)
Added support to parse os name, major and minor
Merge pull request #655 from logstash/logging-fix

- use 'text' instead of 'line' (which is overwritten by Cabin at
Merge pull request #654 from logstash/improve-oldlogstashjson

- improve conversion of oldlogstashjson (@source_host -> host, etc)
Merge pull request #656 from Ziftr/useragent-update

Added support to parse os name, major and minor
- dev version bump
pkg/debian: compare strings correctly
pkg/debian: Implement better conffile detection
pkg/debian: Make the package better

 * Append date, time and git commithash to the local revision for non-releases
 * Add a url and short description to the package
 * Depend on 'default-jre' instead of a specific java version
Update mongodb.rb

Fix for LOGSTASH-1371