Add saveEventually to Model.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>
Change designated party creation method.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>
Merge branch 'master' of https://github.com/Triple-A/Hemmafesten

* 'master' of https://github.com/Triple-A/Hemmafesten:
  runnable loop for starting songs
  branch switch