Module heavily adapted for logstash 1.3

* Made for installation by package as built using github repo's
  `make package`
* Removed default config files, they're not really generic
* Multiple config files possible for each instance (in separate
  directories)
* Updated init scripts with those provided in the logstash repo
* Updated specs
Fix linting errors
fix init script for redhat
Make nb logstash filter threads configurable per instance
Merge pull request #13 from ckaenzig/logstash13

Module heavily adapted for logstash 1.3