Create format_review_files
Create format review file uploader
Explicitly require carrierwave and minimagick
Install cocoon gem
Remove format review active model-related files

Format Review Files will be a nested attribute of Submission
Add new form for uploading format review files
Improve markup for upload format review files form
Git ignore files uploaded via the web interface
Pass on creating thumbnails

Since we can't predict filetype and isn't worth
development cost at this time.
Connect the format review files form to controller