Added some box2d examples based on qml-box2d
disable building examples and demos that won't work with the switch to qml-box2d
white space fixes
Added the gamescene example back fixed up for the qml-box2d branch
dropped demo and examples that used old box2d code
Merge pull request #5 from kenvandine/qml-box2d

Added some new examples based on qml-box2d