- issue is that content machine isn't whitelisted for email
 - this also provides secondary filtering for user registration

Stable edx4edx aws
We may need to switch quickedit, based on feedback from Ike. 

  - django debug commented out in lms/envs/dev.py (temporarily - need cleanup)
  - email backend set
  - index page modified for edx4edx

uses new 'github_url' dict key in multicourse_settings
this replaces the previous "quickedit" functionality

- if no answer given, then symbolicresponse + customrepsonse now
  give an error message, instead of doing nothing
- in capa_module if lcp.grade_answers fails, in DEBUG mode display
  alert with useful error message

bugfix: lcp score can apparently be 0/0

Victor/show student state

* use clearer names for the two status strings passed to js
* add functions to do canonical conversion of progress to js string
* fix updating bug in sequence.coffee
* add some todo comments and other docs to make future expansion easier

* change bottom border of links:
  red for not started
  yellow for in_progress
  green for done

* This should probably be designed at some point.
* Obvious problems: the yellow is not very visible, and lots of people are
  red/green color-blind.

Fix render of lms index with no chapter or section.

modify capa_problem to add <include file="foo"> functionality

Victor/progress tracking