Implemented `side` parameter (resolves #1)#7

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baldassarreFe wants to merge 9 commits intoaliutkus:masterfrom baldassarreFe:side

+491-329

Commits on Nov 15, 2019

Added "CPU only" and "CUDA support" messages during installation
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Cleanup of the batch-wise version of numpy's searchsorted
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Commits on Nov 18, 2019

CPU version: correct impl of left/right and broadcasted tensors support
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test['expected'] did not need to go on a different device
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CUDA version: correct impl of left/right and broadcasted tensors support
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