Implements a new command line option --download-coldfront-data.
When this option is True, the environment variables
KEYCLOAK_CLIENT_ID and KEYCLOAK_CLIENT_SECRET are required.
Additionally KEYCLOAK_URL and COLDFRONT_TOKEN_URL environment
variables can be provided to configure the target KEYCLOAK and
COLDFRONT instances.
Depends on #35, only review last commit.
--download-coldfront-data. When this option is True, the environment variables KEYCLOAK_CLIENT_ID and KEYCLOAK_CLIENT_SECRET are required. Additionally KEYCLOAK_URL and COLDFRONT_TOKEN_URL environment variables can be provided to configure the target KEYCLOAK and COLDFRONT instances.