Create equal interface to histogramdd

[mhieronymus]

Just use edges in get_hist() with following possibilities:

• int: Total number of bins in all dimensions
• [int, int, ...]: Number of bins in each dimension
• [[float, float],[float, float]]: The edges in each dimension

Use range as lower and upper maximum in each dimension.

Use normed: If False, returns the number of samples in each bin. If True, returns the bin density bin_count / sample_count / bin_volume.

Perhaps include weights sometime.

[mhieronymus]

edges has been renamed to bins.
bins can be int or list of lists or list of arrays. Still missing the other arguments.

[mhieronymus]

The interface is there but not everything can be used right now. normed, weights and different number of bins for each dimensions are not supported yet.

[mhieronymus]

Different number of bins for each dimensions works unless you define the edges of them before start. Shouldn't be hard to fix.

[mhieronymus]

Everything works except weights and normed.
See https://github.com/PolygonAndPixel/histogramming/wiki/Using-%60gpu_hist.py%60-with-your-own-software

[mhieronymus]

weights works. normed is still not supported.