Creating a user car.
Initial drag-n-drop car editor.
Small improvements in handlers and canvas display.
Fixing canvas border.
Fixing the user car's chassis' color.
Adding wheel's density parameters.
Adding chassis' densitiy parameter.
Handling negative wheel's radius.
Extracting handlers' colors to facilitate further changes.
Making an easier way to sharing user cars.
Merge pull request #1 from vruzeda/master

Merged additions made by vruzeda