macOS installation via pip about pygrappa

[mckib2]

map.emplace() not compatible with gcc 4.2.1, might want to use a different map method for better backwards compatibility with compilers.

[mckib2]

Numpy/cython part is a bootstrapping issue. Need to look and see how scipy and others handle this problem

[mckib2]

numpy bootstrapping seems fixed on Linux, still need to test on mac and windows. map.emplace has been replaced with insert method, presumably fixing compilation on old gcc/clang compiler, still need to test though.

[mckib2]

Successfully installed using pip on macOS Sierra v10.12.6, clang-900.0.39.2. Considering this a success. The following was run to verify that everything worked:

$ python3 -m venv ~/Documents/venv/pygrappa
$ source ~/Documents/venv/pygrappa/bin/activate
(pygrappa) $ pip install pygrappa
(pygrappa) $ python basic_cgrappa.py # basic_cgrappa.py is from examples module