Silence NumPy warnings. (#8)

NumPy implementation. (#5)

Add support for NumPy.

Add some documentation. (#4)

Add some documentation.
Also:
* Rename `bisect_*_bool_fn` to `bisect_*_pred`.
* Flip logic of `bisect_*_pred`, so we're searching for a `True` instead
of a `False`.
* Added some more tests.

Make limits optional / exponential search (#3)