Debian support added & latest packages used.

packages updated:
passenger updated to 4.0.10
graylog2 updated to 0.12.0
elasticsearch updated to 0.90.2
ruby updated from "1.9.3-p327" to "1.9.3-p448"

apache and passenger config updated to use "#{node[:apache][:user]}" & "#{node[:apache][:group]}"
added attribute for ruby secret needed by graylog2 0.12.0+
Debian detection and support added

missed the secrets template
Merge branch 'master' of https://github.com/ashmere/Graylog2-chef