Changed user_relation value "owner" to "creator" to better align with notification filtering. Made similar changes on project show page to reflect the different instance variable.
Got notif_params to match correctly
Merge branch 'master' into notifications
Fixed merge conflicts with existing notification strucutre

Conflicts:
	app/views/projects/show.html.erb
When a creator comments on their own project, all the collaborators receive a notification.
Creator of a project now gets a notification when a collaborator leaves the project.
When a collaborator comments on a project, the creator receives a notification.
Collaborators get a notification when another collaborator comments on a project.