This fixes the tests of the web engine when running the following from
its root: bundle exec rspec
An engine is meant to have some independence from the main application,
and its tests should be run independently.
This should be using the engine's own dummy application, actually, or
the dummy application of a dependency.
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
