Notifications Api

[SirSeim]

• [x] /api/users/{userId}/notifications GET
  • Get all notifications for a user, based on id
  • Only get those notifications not completed
• [x] /api/users/self/notifications GET
  • Get all notifications for a user, based on token
  • Only get those notifications not completed
• [x] /api/users/{userId}/notifications POST
  • Create a new notification for a user, based on id
• [x] /api/users/self/notifications POST
  • Create a new notification for a user, based on token
• [x] /api/users/{userId}/notifications/{noteId} PUT
  • Update an existing notification based on user's id and notification id
  • Mark it as completed, update tag, comment, link
• [x] /api/users/self/notifications/{noteId} PUT
  • Update an existing notification based on user's token and notification id

[SirSeim]

Just need to write tests for #29 to standardize and test results