Build pip package

Most users only use the Python API. The most convenient installation method is probably pip.

https://github.com/tensorflow/tensorflow/blob/master/tensorflow/tools/pip_package/build_pip_package.sh

@bwasti gave that a shot at some point - assigning to Bram for a look.

good suggestion! I've a rough version here for a python wheel but will need to test on a more devices.