Updated codebase to Python3.6

Major compatibility changes:

Complete route rewrite
- Simplified structure
- Removed blog capabilities (not needed)
Removed HAML, replaced with HTML and Jinja2
SCSS is not longer compiled at deploytime, but rather dynamically per request (also cached)
- TODO: let's talk about how we want to handle this
Updated to GAE Flex environment
Using gunicorn for prod

PyColorado / boulderpython.org