fixed wrong variable name in sleep filter

wrong variable name leads to exceptions when using the sleep filter with
replay option
Merge pull request #548 from ManuelRauber/master

Sleep filter throws exception when using replay option
- fix SIGINT problem on rubinius
- fix a silly bug preventing filters from passing events properly.
- finish updating comment -_-
Unused require
add user so it doesn't always use the default
[rabbitmq] Use Bunny 0.9.1+

Nothing major in `0.9.1` but I'd like Logstash to keep up with recent releases.
[rabbitmq] Use HotBunnies 2.0.0.pre9+
Merge pull request #550 from michaelklishin/patch-1

[rabbitmq] Use Bunny 0.9.1+
Merge pull request #551 from michaelklishin/patch-2

[rabbitmq] Use HotBunnies 2.0.0.pre9+
Merge pull request #552 from ruland/master

add user so it doesn't always use the default
Merge branch 'master' of github.com:logstash/logstash
Disable multiline codec
Escapes character "_" in order to show properly on documentation.
Merge pull request #556 from leandromoreira/patch-2

Escapes character "_" in order to show properly on documentation.
- The plain codec splits by line, and filewatch emits blobs without
  newlines right now, so tack on a newline until filewatch gets
  refactored to emit blobs instead of lines.
- log the compiled code more readably
- clarify rbx issues indicating that I haven't really done any debugging
to figure out where the problem is.
- update changelog with todos
- remove unused require
- try to fix up require() debugger
Merge git://github.com/logstash/logstash