Fixed publish/unpublish/delete

I'm not fighting the line endings more. Something upstream has caused line ending issues.

This PR updates the UX to expose the publishing feature of codalab, newly created competitions are not published by default (and therefore not visible to anyone but the creator). Until they are published they can be deleted.

Once published they cannot be deleted. This logic can be updated if necessary to be more complex and flexible (e.g.  don't allow delete of competitions that have participants other than the owner or other criteria).