Fixed setup.py for installation from pypi style repositories

[ricekab]

Currently, the setup.py is setup incorrectly for installation from a PyPI style repository. These changes ensure the additional packaged files (cacerts.txt and LICENSE) are properly included.

Version is also bumped to match the actual API version. gitignore now also cover PyCharm and common virtualenv location.

Changelist

• Fixed conflicting package_data (include_package_data uses MANIFEST.in).
• Added data_files entry to include "LICENSE"
• Version bumped to 3.0.37 (Git was already tagged as 3.0.37)
• Added gitignore lines for PyCharm (.idea) and virtualenv (venv)

[ricekab]

We just use a fork for this functionality, the changes aren't that much anyway. Feel free to close this PR if you don't believe this is relevant for upstream.