Campaign Epic

[mononoken]

Most of this has been implemented, but I think some of it has been missed. This feature should be crisp before extending the app further.

Scope:

• [x] User can CRUD Campaign
• [x] User who created Campaign is referenced as `Owner
• [x] Owner can invite other Users as Members to Campaign
• [x] Campaign holds multiple Journals that it can display the Notes of together
• [x] #80
• [x] #81
• [x] Members can join a Campaign without a Journal
• [x] Members can leave a Campaign as a member
  • [x] Members joined Journals are removed when the member leaves
• [x] #82
• [x] Members can view the Notes of all joined Journals in an index
• [x] #83
• [ ] Members cannot edit, update, or destroy other members' Notes
• [x] Members can comment on joined Notes
• [ ] Owner can give invite permission to other users of the Campaign as Admin
• [ ] Member can opt to hide specific notes in a joined Journal from Campaign view.
  • [ ] Other Members cannot view hidden Note
  • [ ] Author of Note can still see Note in both Journal and Campaign view
• [ ] Campaign Notes are filterable
• [ ] Members can CRUD Notes from the Campaign view
  • [ ] If Member has one joined Journal to Campaign, it automatically adds the new Note to that Journal
  • [ ] If Member has multiple joined Journals to Campaign, it provides a selector to choose which Journal the new Note is added to
  • [ ] If Member has no joined Journal, it does not display new Note form. Instead, it shows New Journal link that auto joins the Campaign
• [ ] #97