Automatically handle adding a world to a Scene if physics is set to
true.  This also adds world as a property to Scene.

This means we no longer need to include a World inside the scene, for
entities to participate in the world, just need physics = true.
Wrap signals and properties from Box2DWorld with Scene
Automatically handle adding a world to a Scene if physics is set to
true.  This also adds world as a property to Scene.

This means we no longer need to include a World inside the scene, for
entities to participate in the world, just need physics = true.
Wrap signals and properties from Box2DWorld with Scene
Automatically handle adding a world to a Scene if physics is set to
true.  This also adds world as a property to Scene.

This means we no longer need to include a World inside the scene, for
entities to participate in the world, just need physics = true.
Wrap signals and properties from Box2DWorld with Scene
Merge branch 'world-in-scene' of github.com:kenvandine/Bacon2D into world-in-scene
Merge branch 'world-in-scene' of github.com:kenvandine/Bacon2D into world-in-scene
Scene should provide the Box2D world if physics is enabled, fixes #40

Scene now provides World automatically without needing to add a
World container around all entities and bodies.

Added a property to Scene for "physics", if set to true the
scene should create a World.

World and Body are now uncreatable types.
Merge pull request #42 from kenvandine/world-in-scene

Scene should provide the Box2D world if physics is enabled, fixes #40