added a Bullet class, this is one typ of attack
Merge branch 'master' of github.com:propra13-orga/gruppe13
Merge branch 'master' of github.com:propra13-orga/gruppe13
Merge branch 'master' of github.com:propra13-orga/gruppe13
Merge branch 'master' of github.com:propra13-orga/gruppe13