strip trailing slash from package_dir before counting slashes

Fix usage of extras when installing via Wheels; resolves #882

fixes #935 - allows for glob syntax in graft

Try installing requirements before deploying (because the requirements that tox installed aren't available to the Python that Travis PyPI uses for deployment). Ref #934.

Bundle dependencies instead of vendoring them

Update Python versions

Fix certifi fallback is not used on Windows.

Fix GitHub typo

Python 3.6 is out

[CI skip]