Allow creating personal access tokens / OAuth applications with scopes.

app/assets/stylesheets/pages/profile.scss

app/controllers/admin/applications_controller.rb

app/controllers/concerns/oauth_applications.rb

app/controllers/oauth/applications_controller.rb

...controllers/profiles/personal_access_tokens_controller.rb

app/views/admin/applications/_form.html.haml

app/views/admin/applications/show.html.haml

app/views/doorkeeper/applications/_form.html.haml

app/views/doorkeeper/applications/show.html.haml

app/views/profiles/personal_access_tokens/_form.html.haml

app/views/profiles/personal_access_tokens/index.html.haml

spec/features/profiles/personal_access_tokens_spec.rb