Make it clear that a user is submitter, not an Author
Clean up associations (See below)

* `class_name` should be a string (inflection)
* `class_name` is ignored when using `through` (use `source`)
Change `user` to `submitter` for clarity on `Paper`
Merge branch 'master' into paper-role-simplifications
Merge branch 'master' into paper-role-simplifications
Send event record and action down event stream
wip
Convert paper#submitter to paper#creator
Fix event stream specs to match api
wip
Unload litePaper from store when Paper is destroyed
Send paper_role join record destroy action down EventStream user channel
Merge branch 'master' into paper-role-simplifications
change `participation.participant` => `participant.user` to ease consistency
Remove unused method
Add and destroy participant paper roles for participation
Merge branch 'master' into paper-role-simplifications

Conflicts:
	db/schema.rb
Event stream handling of participations
Fix broken specs due to incorrect setup
Fix reloading of comments for spec