Fixes #14898 - Fix for config task
Removing undefined variable took care of it.

Fixes #14843 - Improve rake config error handling

Currently rake config doesn't give you any hint when you provide an
invalid setting. Instead, it should tell you what was wrong with the
input, and try to guide you to a valid one.

This commit provides error handling for wrong JSON values, and prints...

fixes #14866 - prod2dev Rails 4 compatibility

- change .first call which checked presence of id field, but would be
automatically sorted by the primary key ('id'), causing errors on
join tables without the column
- update use of offset/limit in model finders...

fixes #14820 - override Rails log level with Foreman::Logging config

The log_level is expected to be explicitly configured in the Rails
config in the production environment.

Fixes #14778 - Ensure parsing complex types keep target type

Without this patch, the config task would send complex types as
strings to the setting model.

This patch makes the parsed object to keep the target type and it
assumes the setting model will do the internal conversion (now to...

fixes #14741 - translate template kind string, not object

Also convert translation keys to strings in debug mode to prevent
concatenation errors.

fixes #13244 - update Rails to 4.2.6

- Add responders gem to support class-level respond_to usage
- http://edgeguides.rubyonrails.org/4_2_release_notes.html#respond-with-class-level-respond-to
- Replace foreigner with native Rails 4.2 FK support
- uses a patch from Rails 5 to support Foreigner's...

fixes #14638 - Refactor Subnet into STI to allow different subnet types

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 #12318 - support preview for deb-based distros