Fix unicode for errors on capa problems

removes choiceresponse wiping after clicking Show Answer

Enable per-student background tasks.

Fix acceptance tests expecting outdated CSS.

Refactor Advanced Settings page to use Backbone notifications.

Backbone notifications secondary actions

Change width of labels for multiple-choice capa problems to width of text, not 100%

Handle secondary actions on notifications either specified as a single object,
or as a list of objects. Under the hood, the initialize method converts a single
object to a list containing a single object.

Ned/pylint fixes

Previously the "saved" view was never hidden, even after more data was
edited. So if one field was saved successfully and then another was
not, we would find ourselves in the unfortunate situation of seeing
both views at once, leading to much confusion.

Update discussion documentation

Fix typo in output message of rakefile

Forgot to remove registration of onKeyUp function.

Remove keybinding for work in progress (WIP).

Stanford got some feedback from our students/faculty that students
were making accidental clicks on radio-button capa questions.
They would click way to the right of the label text, but it would
still select the corresponding input, which caused some students
to make unintentional changes to their answers.  This was because
labels for these inputs were display:block and width:100%

Changing these labels to float:left clear:both should fix it.

fix gradebook tests

STUD-329

create-dev-env.sh:  if run from repo, set $BASE appropriately

Remove the unused smart-accordion lettuce feature, and the code it used.

Fix 500 error on reactivation email

Remove unused reactivation email function