Add Motion examples

Placeholder for Motion examples PR
Add Motion examples
Style/idiom/copyediting
Style/idiom/copyedit
Fixes

- Remove unnecessary `config.py`.
- Rename `id` to `index`.
- Idiom: Iterate over `self.others` instead of using a range.
Use Processing `dist()`
Style/idiom

CubesWithinCube:
- Make `BOUNDS` a parameter.
- Remove `config.py`.

Reflection1:
- Pythonize construction of the `coords` list.
Derp. Remove BOUNDS as an object property.

Should have been an arg to cube.update() all along
Remove BOUNDS as an object property.

Should have been an arg to cube.update()
Merge pull request #82 from tildebyte/Motion

Add Motion examples