RPM packaging fixes

* fix therubyracer require name
* when Foreman launched twice within same PID, ENV['BUNDLE_GEMFILE'] is already
  set, causing bundler to load instead of bundler_ext
* revert SCL additions to init.d script, spec file handles them
* fix init script path
* export HOME in init script as Puppet requires it
* add gettext_i18n_rails_js dependency, minor dependency fixes to compile
  assets and match RPM versions
* create settings.yaml to precompile assets
* specify required attributes for local_secret_token.rb
* comps updates

@skottler, would you mind looking at this?  This was the set of changes required to build this: http://koji.katello.org/koji/taskinfo?taskID=36039 complete with assets precompilation.

(I meant to put the entire description in the PR, not the commit, feel free to remove it.)