* New webgl_physics_brick demo. Cutting a convex by a plane works, but it must be refactored to work from Geometry, not from "segmentedobject"

* webgl_physics_brick: Splitting a convex mesh with a plane works.

* webgl_physics_brick: Preparing to refactor objects

* webgl_physics_brick: Refactored objects to hang on the THREE.Object3d

* webgl_physics_brick: Radial subdivision works. To do: non-radial one.

* webgl_physics_brick: Non-radial subdivision works.

* 'breaking things' example works.

* added webgl_physics_convex_break to example index. Aded a pyramid.

* webgl_physics_convex_break: Add friction

* webgl_physics_convex_break: Add velocity and angular vel. from parent.

* webgl_physics_convex_break: Change guideline comment.

* webgl_physics_convex_break: Changed page title.