2018-08-02 Version 0.5.0

Features

Implementation is now using ADAL and not request-oauthlib. This allows more AD scenarios (like federated) #94
Add additionalInfo parsing for CloudError #102

These breaking changes applies to ServicePrincipalCredentials, UserPassCredentials, AADTokenCredentials

Remove "auth_uri" attribute and parameter. This was unused.
Remove "state" attribute. This was unused.
Remove "client" attribute. This was exposed by mistake and should have been internal. No replacement is possible.
Remove "token_uri" attribute and parameter. Use "cloud_environment" and "tenant" to impact the login url now.
Remove token caching based on "keyring". Token caching should be implemented using ADAL now. This implies:
- Remove the "keyring" parameter
- Remove the "clear_cached_token" method
- Remove the "retrieve_session" method