Merge pull request #935 from noesya/people_and_organizations_categories

...s/admin/university/organizations/categories_controller.rb

app/controllers/admin/university/organizations_controller.rb

...trollers/admin/university/people/categories_controller.rb

app/controllers/admin/university/people_controller.rb

app/models/ability.rb

app/models/communication/extranet.rb

app/models/university/organization.rb

app/models/university/organization/category.rb

app/models/university/person.rb

app/models/university/person/category.rb

app/models/university/with_people_and_organizations.rb

app/services/filters/admin/university/organizations.rb

app/services/filters/admin/university/people.rb

app/views/admin/university/organizations/_form.html.erb

.../admin/university/organizations/categories/_form.html.erb

.../admin/university/organizations/categories/_list.html.erb

...s/admin/university/organizations/categories/edit.html.erb

.../admin/university/organizations/categories/index.html.erb

...ws/admin/university/organizations/categories/new.html.erb

...s/admin/university/organizations/categories/show.html.erb