v0.17.0
Speed up importing of past.translation (issue #117)
Remove import of dummy_thread from _thread module (issue #124)
Fix py2.6 compat issues
Make imports of http.client constants compatible with Py2.6 (issue #137)
Fix bugs introduced in #368
Port futurize's fix selection logic to pasteurize
Update copyright notices to 2018; Re-add Py2.6 and Py3.3 support; Update credits
Fix for issue #262 (non-existing tkinter imports in older py27 versions)
Make the src folder a package (for the same of importing src.future.__version__ etc. from setup.py)