Documentation updates

[leios]

Things I know I need to document:

• [x] Postprocessing examples
  • [x] Clip
  • [x] Filter
  • [x] Writing your own (op and initialized for each postprocess)
• [x] Layering
  • [x] ColorLayer
  • [x] ShaderLayer
  • [x] FractalLayer
  • [ ] ImageLayer
  • [ ] Transformations on layers
• [x] Time Interface (Int, Float, Unitful)
• [ ] Hutchinson quirks
  • [ ] Fee
  • [ ] Fi
  • [ ] Fo
  • [ ] Fum
• [ ] Objects
  • [ ] primitives: rectangle (square), triangle, circle, line (when completed)
  • [ ] LolliPeople / LolliLayers