Fixes #14645: fix production images for plugins.

Images were going through the legacy asset helpers in
sprockets-rails, this commit sets some options on the context
class to ensure we are looking up digested images in the correct
path.

http://projects.theforeman.org/issues/14645

Fixes #14508 - foreman-rake console can take arguments

One can now say e.g.

foreman-rake console -- --sandbox

We need the --, otherwise foreman-rake itself tries to interpret the flags

Fixes #14221: Use Sass Rails template when compiling plugin assets

The Sass::Rails::Template is needed to resolve css files imported
in an SCSS file without setting them to css imports which lead
to 404s in production.

fixes #14076 - remove unused Puppetclass hostgroups counter

fixes #8874 - rework POT/PO updates for gettext 3's edit.po

3.1.13 adds an intermediate .edit.po file alongside each .po, which is meant
to be kept outside of SCM and updated by users, whereupon it's merged back into
the .po on the next rake gettext:find execution....

fixes #13033 - require new location of gettext_i18n_rails_js tasks

Fixes #13098: Set assets environment the same as core assets

The introduction of Sprockets 3+ led to the environment-version
being set to ActiveSupport::StringInquirer object instead of a
String. The Sprockets digest method does not support digesting
classes of type ActiveSupport::StringInquirer....

fixes #13005 - enable CSS compression in plugin precompilation

Fixes #7230, #12021 - Upgrade to Rails 4.1.5

This commits upgrades Rails to Rails 4.1.5. See a description of the
changes included here, and go to the pull request in GitHub to see more
detailed explanations:

• Update gems to a Rails 4 compatible version, including dependencies...

Fixes #11307 - Add host count to hostgroups