Create UI for adding owners developers to application

Added owner_emails and developer_emails to model because we need to store plaintext record as well as associations to user model.
Merge branch 'devel' into feature/multiple-owner-ui

Conflicts:
	app/controllers/applications_controller.rb
	db/schema.rb
	spec/models/doorkeeper/application_spec.rb
Update owner_emails migration to backfill field
Show values from failed save on applications page

Split the call to update_attributes into attributes= and save so that we can set the (wrong) attributes and do the special controller validation for current_user.
Merge pull request #364 from 18F/feature/multiple-owner-ui

Create UI for adding owners developers to application