Django-pdfkit

- Fixed package version number.

- Fix pylint 'no-else-return' linting issue.
- Change location of wkhtmltox - the old location seems to have disappeared.
- Fixes 7 - Added Django 1.11 and Python 3.6 support.
- Added args and kwargs to classview functions (5)
- Added args and kwargs to classview functions which get passed through to get_context_data.
- Set the MEDIA_URL setting just like STATIC_URL is set.
- Now using dict rather than RequestContext for future Django support.

- Fixed munge of django_pdfkit/__init__.py (4)

- Codecov integration (3)
- Travis CI integration (2)
- Now using WKHTMLTOPDF_BIN over class setting wkhtmltopdf_bin (1)
- Added git-tools

- Initial release