[elasticsearch_river][Fix] use mq.publish_serialized instead of receive_raw

receive_raw is no longer available in RabbitMQ.

elasticsearch_river throw the exception "undefined method `receive_raw'"

This commit fix issues 1298 and 1384
Update grok-patterns

Add LOGLEVEL pattern "ALERT"
Make 'if "something" not in [nonexistent] { ... }' succeed

My argument is checking for the absence of a value in a field that doesn't
exist should return true, currently it is false.

This fixes the case where an event which has never been tagged now works with
this logic:

    grok {
      ...
    }
    if "_grokparsefailure" not in [tags] {
      ...
    }
Small enhancements to netflow codec

- Add configurable target field for netflow fields, defaults to "netflow"
- Add configurable filter to restrict which versions to accept
Upgrade jruby
Fix memory leak in syslog input. (tcp server)

Remove the client from the clients list when the connection is closed.
Fix json codec to accept json on a single line
Merge pull request #710 from logstash/json-codec-fix

Fix json codec
Fixed varname for endpoint_region
Merge pull request #712 from jujugrrr/s3-output-varname

Fixed varname for endpoint_region
Merge pull request #672 from vspiewak/patch-1

[elasticsearch_river] Fix undefined method receive_raw
Merge pull request #674 from fbarbeira/patch-1

Update grok-patterns
update changelog
Added 'proxy_uri' option to AWS-based plugins.
Rename sort to collate. I felt that collate was a more accurate term.
- Update changelog through 8f10ba8a854df9a3f678c363af0a52f168285c8e
- tweak wording
Merge pull request #714 from malthe/add-aws-proxy-support

Added 'proxy_uri' option to AWS-based plugins.
fixed unix input: syntax error
Update JRuby auto-installer in bin/logstash to use JRuby 1.7.5