Implement project type attribute
Fix person creation not working because of missing strong param

* PeopleController was not having :name in its strong params

* As a consequence, :firstname and :lastname couldn't be extracted from
  :name, and the person object could not be created.
Fix failing contexts spec for AddingAPerson

* The spec example on commanding the controller was failing because
  of a mistake in the name of the callbacks to call in case of
  success or failure.