[clean] remove unused background image
Revert "[clean] remove unused background image"

This reverts commit 4b7cddb683c60d844b1f155345b39f4892d82b7b.
Merge branch 'GregBe' of https://github.com/Marco-Meyer/TINF13AIBI-Kinect into GregBe
Merge remote-tracking branch 'origin/master' into GregBe
slide and lose sound + timer

+ slide sound + timer
+ lose play
del stop sound

-stop sound
+-in p.mixer.sound.play
Music and Sound

+ Background music
sound.py new method with volume
+slide and lose sounds are now playing correctly
Conflict Resolve
Merge remote-tracking branch 'origin/master'