Federico Baldassarre

Implemented `side` parameter (resolves #1)

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This PR includes: - C++ code for searchsorted with correct support of `side=[left|right]` - CUDA code for searchsorted with correct support of `side=[left|right]` - helper functions for broadcasting numpy arrays...

Implement the `side` keyword argument as in numpy

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The Numpy version of [searchsorted](https://docs.scipy.org/doc/numpy/reference/generated/numpy.searchsorted.html) takes an additional parameter to specify the semantic of the returned index: side | returned index i satisfies -- | -- left | a[i-1] 

Currently invoking `lo()` on arrays that contain non-numeric dtypes fails when checking if the array is all-zero, and when computing min/max/mean/std: Input: ```python lo(np.array(["bla", "bla"])) ``` Output: ``` -> zeros...

The website [mldata.org](mldata.org) is down and there is no hint of it coming back. So these lines that fetched the USPS dataset no longer work: ``` from sklearn.datasets import fetch_mldata...