Add logging support for Comet

[sebastianberns]

Runs can now be monitored with Comet.

Add comet logging to your config:

    logging:
      use_comet: true
      project_name: "example-project"
      run_name: "test-run"

[sebastianberns]

Note: the default code logging is disabled, because it is not necessary to upload the toolkit run scripts.
However, the config is logged as hyperparameters.