Improvements
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- Removed broken projects from /contrib
- Update setup.py with project_urls and long_description.
- Added Window.get_pixel_ratio function for calculating scaling on HiDPI displays.
- Start some code quality improvements, such as whitespace removal, star imports, etc.
Bugfixes
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- Fix invalid argtype in image GDIplus decoder.
- Change sys.is_epydoc to sys.is_pyglet_doc_run to prevent crashing with Anaconda, etc. (9)
- Prevent gl_info.get_version from crashing with blank version string. (36)