fixes #18691 - add as_deprecation_tracker to test environment

Causes test failures if any new deprecation warnings are triggered by
changes in Foreman. Plugin code is automatically whitelisted unless it
supplies its own ASDT whitelist configuration, so developers can opt-in....

fixes #16996 - reduce eager_load of tables

Refs #12364 - webpack server can serve assets on https

Refs #12364 - Only load the dev server js if it's enabled

Also allow disabling the dev server from the settings file

Fixes #12364 - Use NPM+Webpack to handle external assets

This commit introduces NPM and Webpack to handle external assets.
It also provides ES6 support and a live reload dev server that can be
used by running `foreman start` instead of `rails start`.
Do not forget to run `npm install` before starting the server....

fixes #3917 - replace protected_attrs with strong parameters

Filtering of attributes has moved from the protected_attributes gem to
strong parameters in controller concerns, to be in line with current
Rails recommendations.

Concerns are shared between UI and both API controllers and list the...

Refs #12193 - Remove remaining cached counters

Refs #3809 - Turning on some rubocop cops

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 #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...