test for equals in Projectile
Merge branch 'master' of https://github.com/Kuxe/oopprojekt
test for visitSpaceship in Projectile done
test for cisitAsteroid in Projectile done
test for visitProjectile() in Projectile done
Test for add- & removePropertyChangeListener in Projectile done
Merge branch 'master' of https://github.com/Kuxe/oopprojekt