Week 23

Demos:
  * Port Barkley Model
  * Make Path Integrals uses WebCLGL interop
  * Add references/credits in source code
  * Create a common file (gl.js) to be shared by the demos
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