According to the elementtree spec, elements with no children test as false. We only want to skip checking for module ids if the module is actually not found

* Change looping code style in seq_module
* Clone and keep the latest version of jasmine-jquery locally
* Use django-pipeline asset tags

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

to show quickedit when settings.QUICKEDIT is True.  add
mathjax_include.html because that is needed by quickedit.html

filestore not None.  mitxhome.html now properly automatically lists
all courses given in settings.COURSE_SETTINGS.  mitxhome now served
from multicourse.views.  optioninput.html was missing; fixed. cleaned
up access to request.session for coursename in courseware/views.py

Display specific error messages when parts of the courseware break, rather than returning a 500 indicating that the whole site is down