Refactor rename step for increased precision
Add step: generic tok. auth. handler for controllers

This step makes the controller configuration more visible within
the scenario. It also allows to configure any controller as
token autentication handler for several token authenticatable models,
and with arbitrary sets of options.
Add failing scenario
Add support of several devise scopes in one controller

Closes #64
Refactor: reword Cucumber features, add examples
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
Merge branch 'add-support-for-multiple-scopes-by-token-authentication-handler'
Bump version number