There were a few changes needed:
* Plugins are now specified through `plugin:` config keyword.
* All plugin gems need to be specified explicitly in Gemfile since they
are no longer dependencies of plugins already specified explicitly.
* All plugin gems need to be updated in other to use the new APIs.
* One cop was renamed.
* New offenses safe to correct were corrected directly with `bundle exec
rubocop -a`.
* New offenses unsafe to correct were added to the TODO configuration
with `bundle exec rubocop --auto-gen-config --auto-gen-only-exclude
--exclude-limit 1400 --no-auto-gen-timestamp`.
AngularJS templates are compiled as assets on deploy. Any translatable
text can't be translated in Ruby during compilation because it's static
text. It needs to be translated with an AngularJS filter in the browser.
This fixes the following deprecation warning
```
DEPRECATION WARNING: Extra .css in SCSS file is unnecessary. Rename /usr/src/app/app/assets/stylesheets/darkswarm/variables.css.scss to /usr/src/app/app/assets/stylesheets/darkswar
m/variables.scss. (called from _app_views_layouts_darkswarm_html_haml___3990351141569700945_46957256630860 at /usr/src/app/app/views/layouts/darkswarm.html.haml:18)
(...)
```
The route and controller were in the main app and the views in the engine, with this commit they stay all inside the engine
This is done to keep it simple and remove the unnecessary dependency between main app and engine
If we use this mechanism in the future for other things in the main app or other engines, we can find a way to extract/abstract this
