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
Merge remote branch 'upstream/master'