Tests pass on both Python 2 and 3 now. Yay! MockFont is handy for mtiLib.__init__:main(). Not sure how useful it is otherwise, and what to replace it with.
The *.txt data in this directory was imported from: https://github.com/Monotype/OpenType_Table_Source/tree/gh-pages/downloads at the following revision: 8a4db481c63efe468092d7e9cd149d2e9786369a plus fixes for the following issues: https://github.com/Monotype/OpenType_Table_Source/issues/11