Fonoapi

* Fixed package `ImportError` on Python 3
* Updated the unit tests so that they all pass
* Ensured that package and unit tests are working on both Python 2 and Python 3
* This release is on PyPI (https://pypi.org/project/fonoapi/)

* Fixed error in `setup.py` where the `fonoapi` package was being imported into `setup.py`, meaning that if you were installing the package onto a machine that didn't have one of the packages in `install_requires` installed, the installation would fail. Fixed by removing the import in `setup.py`, and copying some of the variables that were imported into `setup.py` itself