Style and content updates:

* Added icons to main navigation
* Flush out the Download page
* Misc content tweaks to Index, Screenshots, and Videos pages.
Moar updates:

* Implement django-compressor to compress css/js
* Post-compile scripts to collectstatic and compress on Heroku
* Serve static files with dj-static
* Tweaks to page content
Script to run everything on Heroku.
Specify Python version for Heroku.
Fix for post_compile.
Add django-jsonify to reqs.
Install front-end deps with Bower.
Print out some paths. For debugging.
moar debug printing.
Remove debug print statements.
Add FontAwesome to bower.json
Add NewRelic to requirements.txt.
Add PyYAML to requirements.txt.
Static assets are compiled on deploy, no need to re-compile on app startup.
Set up memcacheify.
Integrate Sentry for error logging.
404 and 500 templates.
404 and 500 templates.
Fix raven.
Gunicorn updates.