Disabled token-based auth for contaners created with rep2docker as the proxy is already enforcing authentication.

Added support for creating new software container from Binder-compatible Git repositories. Minor code refactoring.

Removed dedicated models for computing and user conf, and merged it in the models themselves. Added support for the groups. Minor fixes and improvements.

Added the manager and conf properties to the Computing class. Global computing conf refactoring. Minor fixes.

Added support for OpenID Connect with mozilla-django-oidc==1.2.4. Minor refactoring of some user-related parts.

Parametrised webapp host+port and local docker registry host+port. Moved all data (registry+shared) in the data_rosetta folder.

Parametrized remote tasks host and access key. Added container name. Global refactoring and cleanup.