Start with ADN authorization

This is gonna be ugly. ADN returns the access_token after the hash. So a simple local webserver doesn't see the token in the request. I have to add a real html-page with a bit of javascript to extract the token and get it into the software...
Make adn-authorization work

 - If there is no access_token in the config:
     - Start a small http-server on localhost:8000
     - Request authorization with adn and wait for the redirect on localhost:8000
     - On a simple get for '/' return a simple page with javascript to extract the access_token from the anchor
     - Get localhost again with the access_token as GET-parameter
     - Save the access_token in the config
 - Use the access_token from the config for api-authentication
adopt the status in the readme
Merge branch 'feature/real_adn_authorization'