update
Merge
Added walls
added docs to Wall and WallGroup
fixed issues in Wall and WallGroup
Merge pull request #6 from NicLew/lewe4441_Character

Lewe4441 character
Fixed merge conflicts
Merge branch 'TwoSeconds-lund3480_issue_addWalls
Added targets and game loop
fixed comment in TargetGroup
Merge pull request #7 from TwoSeconds/lund3481_issue_addTargets

Lund3481 issue add targets