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

Added check if the task interface is up, and marked the task status accordingly - including graying out the connect button if not up yet.

Bugfix of some strange behaviour of an https:// contained as part in the URL transformed into https:/.

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

The registry is now exposed by the proxy server under SSL. Adapted the docker-compose-dev.yml file and the standaloneworker accordingly.