v0.16.0
Speed up importing of past.translation (issue #117)
Remove import of dummy_thread from _thread module (issue #124)
Comment out PEP 461 tests for now
Make imports of http.client constants compatible with Py2.6 (issue #137)
Issue #190: clean up unused `libfuturize` fixer `FixOldstrWrap`
Also add ttk support to future.moves
Update copyright dates to 2016
Add more underscore-prefixed imports to `tkinter` (issue #233)
Make the src folder a package (for the same of importing src.future.__version__ etc. from setup.py)