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 handling of chuncked gelf messages
test for reading chunked gelf messages
Merge branch '1.2.1.fixes' of https://github.com/Syntigo-nv/logstash
fixed unix input: syntax error
Update JRuby auto-installer in bin/logstash to use JRuby 1.7.5
Merge pull request #703 from logstash/upgrade-jruby

Upgrade jruby to 1.7.5
Merge pull request #721 from untergeek/master

Update JRuby auto-installer in bin/logstash to use JRuby 1.7.5
Updated JRuby URL for downloading 1.7.5
Merge pull request #722 from untergeek/master

Updated JRuby URL for downloading 1.7.5
- remove old junk
Merge pull request #723 from logstash/remove-unused-build-stuff

- remove old junk
Merge pull request #682 from bodgit/notin

Make 'if "something" not in [nonexistent] { ... }' succeed
Merge pull request #686 from bodgit/netflow

Small enhancements to netflow codec
Additional csv option for quote_char

This will allow users to configure a different quoting char in cases where the data may not exactly fit the csv standard.

A common example may be to completely ignore the quote char, and to do this a null \x00 char can be used instead.
Another example may be csv with ' as the quote char instead of "
Add test for default csv quote_char double quote "
Merge pull request #725 from markabey/csv_quote_char

Csv quote char
Merge pull request #720 from nikicat/fix-unix

fixed unix input: syntax error