Awkward

PR 8: C++ NumpyArray::getitem is done, setting the pattern for other classes (external C functions).

The Numba and Identity extensions are not done, which would be necessary to fully set the pattern.

Up through PR 4: `NumpyArray` and `ListOffsetArray` usable in C++, Python, and Numpy. C++ and Python have an `Identity` framework for particle kinematics (see [combinatorics language](https://github.com/jpivarski/PartiQL#readme)). The `dummy1` and `dummy3` functions tested in deployments 0.0.x have been removed (`Identity` has some real code in cpu-kernels).

Try to build MacOS 10.9+ images, rather than 10.13+.

A suite of dummy routines, compiled, tested, and deployed (to PyPI as wheels) for the whole build matrix: {Pythons 2.7, 3.4, 3.5, 3.6, 3.7} × {Windows 32-bit, Windows 64-bit, MacOS, manylinux1_i686, manylinux1_x86_64, manylinux2010_x86_64} × tested for {Numpy 1.13.1 or 1.14.5 (earliest available for a Python version) and latest}.

Eventually, Numba versions will be tested, though not as a whole matrix (earliest Numba with earliest Numpy, latest Numba with latest Numpy), so that adding Numba doesn't explode the size of the matrix.