- Done: added background-refresh of messages in fixed time intervall
   - New answers are appended
   - Notification sound is played
   - Notification is displayed

- Todo: fix user profile by setting picture (thumbnail) size to a unified one
- Todo: user/updateAccount: delete old picture!
- Todo: fix about/find-me-select
- Todo: fix notifications to real push version instead of requesting news in fixed timeintervalls from the server
- Todo: replace login form with the reduced one