- Added a new example of tiling: tiled gradient - Reorganized the file so that the first code snippet is the simpler and then   following examples become harder.
- Added a new example of tiling: tiled gradient
- Reorganized the file so that the first code snippet is the simpler and then
  following examples become harder.

born2late/afterstep-devel,born2late/afterstep-devel,born2late/afterstep-devel,born2late/afterstep-devel,born2late/afterstep-devel