Added the iso_support.json file to our RPM spec.
Added an __str__ method to the ISO model.
Add STATE_FAILED to the imports for publish_progress.py.
Added some notes to the progress files.
Remove repo.id from the build directory during publishing.
Don't check that build_dir exists for every unit during publish.
Some changes and notes from code review.
Merge branch 'rbarlow_iso_importer_distributor' into rbarlow_test_iso_importer_sync

Conflicts:
	pulp_rpm/src/pulp_rpm/plugins/importers/iso_importer/sync.py