Live email notifications

Preconditions:
- The Mail Sending should be configured: Configure Mail Sending
- An user exists and has an email address set in its profile
- Eventually, go to webapps\xwiki\WEB-INF\xwiki.properties and set notifications.emails.live.graceTime = 0 to enable the sending of e-mails instantly. Make sure the line is not commented out (doesn't have an # at the start of it).

1. Log in as a simple user (with email address in the profile)
2. Click on the bell in the top right corner
3. Make sure the entire wiki is followed
4. Click on Settings, in the right side of Notifications menu
5. Set "Email Frequency" to Live
6. Make sure that all the options in the Email column are set to ON
7. Log in with another user or with Admin
8. Create/update/delete a page
9. Comment in another page
10. Mention the used user in the content of a page