Update stale comment
No longer add thumbnails to the zipped set, removed a dead method.
Changes content type factories to have a public core record, which should have always been the case.
Fixes buggy conditional check
Adds a test that ensures the zip compilation job is functioning correctly.
Fixes the compilations download JS by making it more like the shopping carts JS that also handles downloads.  Refactoring these two bits of very similar code into one bit of code should be an immediate post-release priority.
Merge pull request #341 from nu-lts/feature/bug_squashin_315

Feature/bug squashin 315