Update dev script repos

Arjun/choiceresponse

* need to be in mitx/ to install common/lib/*
* create data dir if it doesn't exit
* add a few more log messages
* Change url for our fork of django-pipeline to stop the hanging checkouts.
  It works either way on my machine, so not sure if this will fix it.

Merged two multiple-choice-like response types into a single response; created inputtypes for checkboxes and radio buttons adn cleaned up the code a bit. Fixed checkbox responses.

minor patch to fix optioninput; merging this in now, to unblock berkeley's changes to MC; passes my tests.

CodeResponse restricted to only one answer field

Kimth/lms coderesponse

* remove hg data repo
* pull the 6.002x repo

fixed the bug that you can enroll a course several times

Minor bug fix. Properly handles script tags where there are spaces before closing brace. 
Code is also more elegant than original. 
Note that this is not a security bug, as the fix indicated.