replace FactoryGirl.create with FactoryGirl.build_stubbed for boundary_score
change factory to allow building via stubbed
don't hide categories when delete fails
first attempt to do file-upload capability with S3
remove music from registrant_event_choice, putting it into its own 'Song' model. Add scaffolding for uploading songs
move songs under registrant scope, restrict access to your own registrants only
stub another model in test
update to fix broken test due to ability changes