Autoclose notifcations after x seconds

Prefs so user can change when it shall close
Remove notifications on page
Don't use service variable on crime/car/etc

The service variable is not updated often enough, making the
notifcations up to 30 seconds too late
Merge pull request #45 from Sebbe/remove-notifications-on-page/time

Better notifcations
replace "NO-BREAK SPACE" with space
remove all preferences on manual reset
ask user to reload after resetting prefs
bump version to force update