v0.5: Tons of changes! Version bump to 0.5

 - Now with Python 3 support
 - Added PyPI build framework
 - Converted Dirpy to a module, with a wrapper binary
 - Created README from internal documentation and converted
   it to markdown.
 - Added API and benchmark documentation.
 - Benchmarked Pillow-SIMD; noticably faster than default Pillow
 - Added systemd & uWSGI startup scripts
 - Added Apache license
 - Added Redfin Code of Conduct and contributing guides.
 - Added config lint.