Nperlinnoise

- bugs fixed
- docs implemented
- readability improved

v0.1.2-alpha[x]:
- packaging trails

- deprecated mesh grid in gradients, now `cm` is calculated auto
- more `in-code` docs added
- `PEP440` convention will be followed from the release

- docs improved
- yanked due to wrong link to maintainer

- support for grid mode added
- merged commons from `__call__` of `NPerlin` and `Noise`

- docs on usage refactored
- restructured folder tree

- improved docs, appended usage section
- renamed import directory `NPerlinNoise` to `nPerlinNoise`