Week 24

Demos:
  * Fix WebCLBuffer copy in Barkley.
  * Fix getBuildInfo in Droplet.
  * Fix CL <-> GL interop transition in PathIntegrals.
  * Make a better organization on SmallPathTracing and common/gl.js files.

New ports:
  * RippleEffect
  * Sobel-CorG
  * VideoCube
  * XY
  * XY3D