clahe 0.1.2

Pure rust image implementation of clahe
Documentation 
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# clahe-rs

Reimplementation of opencv's CLAHE in pure rust.
This includes implementing u16 -> u8 conversion which was
missing in the other crates I tried.

Unlike the opencv version this:

- does not use threads (see future work, rayon could do this)
- does not do manual loop unrolls
- iterates over regions rather than lines during interpolation

Its unlikely this reaches the single-core throughput of the heavily optimized
opencv version (though I tried to maintain the structure that makes it
possible), if you are interested in making it faster let me know.

## Examples

|       Before        |          After          |
| :-----------------: | :---------------------: |
| ![](honeycomb.png)  | ![](honeycomb_out.png)  |
| ![](high_depth.png) | ![](high_depth_out.png) |
|  ![](fractal.png)   |  ![](fractal_out.png)   |

# Future work

- More performance testing
- Rayon threading
- Integrate into [imageproc crate](https://github.com/image-rs/imageproc)