Fix missing data files on install.
Fix missing data files on install.

`include_package_data=False` prevents the use of the `MANIFEST.in` hence some data files under `exodata/data/` where missing, see [1] under `include_package_data`.

[1]: https://pythonhosted.org/setuptools/setuptools.html#new-and-changed-setup-keywords
ryanvarley/ExoData