As a user, I want a notification when someone from my following sends a cheeps or when someone tags me in a cheep

[JojoStarman]

Acceptance Criteria:

• [x] An authenticated user will receive a notification on a notification page
• [x] Users can see all the notifications they ever recieved on the notification page
• [x] The notification will pop up once someone from the user's following list has posted a cheep
• [x] The notification will pop up once someone has tagged the user, even if they are not followed by the user
• [ ] UI test to show that the notification pops up on the user's screen when being tagged
• [ ] UI test to show that the notification pops up on the user's screen when their following cheeps
• [ ] UI test to show that the user can click the notification box icon and see recents notifications
• [ ] Unit tests to ensure the newly created methods for the notification functionality works
• [ ] In genereal, any created methods should be tested sufficiently