Url encode memcache keys, rather than writing a new encoding scheme. Also use fasthash, rather than md5

Asset pipeline

Split the pipeline_mako templates from the namespace used by actual django-pipeline django templates

Conflicts:
	static/js/application.js

Add newrelic handler, rather than custom function to log exceptions

Adds ARIA labels to navigation

This includes calculator open/close button, navigation, profile, and
book's table of content.

First part of courseware refactor

Delete settings.py in favor of envs/*.py, and add a rake task to run a d...

fix multicourse; fix bug in I4xSystem - self.filestore not set when

Don't pipeline in dev environment, which means that there is no need to run collectstatic either. Hooray\!

Delete settings.py in favor of envs/*.py, and add a rake task to run a dev server locally from those settings

Conflicts:
	static/css
	static/css/application.css