daily automatical update at 4:00
Merge branch 'master' of https://github.com/florian89/CafeteriaTUE into autoupdater

Added an autupdater updating at 4:00
Constant for the shared preference name
Javadoc and styling
Removed wrong @author tag
Added a settings screen containing an option to turn the autoupdater on
and off
Merge branch 'autoupdater'