add support for building swagger/OpenAPI JSON

to build, run `make swagger`; a file named `swagger.json` will be
written to the current working directory

awx/settings/development.py

@@ -101,6 +101,8 @@ if 'django_jenkins' in INSTALLED_APPS:
     PEP8_RCFILE = "setup.cfg"
     PYLINT_RCFILE = ".pylintrc"
 
+INSTALLED_APPS += ('rest_framework_swagger',)
+
 # Much faster than the default
 # https://docs.djangoproject.com/en/1.6/topics/auth/passwords/#how-django-stores-passwords
 PASSWORD_HASHERS = (