Add ubuntu and centos distributions
Merge pull request #2133 from opf/hotfix/packager_add_ubuntu_and_centos_support

Add ubuntu and centos distributions
Revert "Fix sprockets file exposure vulnerability"

This reverts commit 850e052fba68d1ad2f381f00d422940bac420f03.
[real fix CVE-2014-7819] use 2.2.3 based sprockets

PR #2138 comment is wrong.

https://github.com/finnlabs/sprockets-rails/pull/1