Refactor Cucumber step: improve variables names
Refactor Cucumber features, remove duplicate step
Refactor Cucumber features, remove another duplicate step
Refactor Cucumber features, remove a third duplicate step
Refactor Cucumber steps, reduce step/generator coupling

That cucumber step was tightly coupled with the Rails controllers
generator. Inserting lines instead of overwritting the whole file
makes the step independent from the generator.
Update doc/features.html
Add documentation: multi-scope token auth. handlers