This restores functionality that has been broken since the introduction of
XModuleDescriptor/XModule proxying (part of the XBlock transition). It generates
a CSV of all answers for all content of type "problem" in a given course, with a
row per (problem part, answer). The format is:

url_name, display name, answer id, answer, count

Example values:
  url_name = "7f1b1523a55848cd9f5c93eb8cbabcf7"
  display name = "Problem 1: Something Hard"
  answer id = i4x-JediAcdmy-LTSB304-problem-7f1b1523a55848cd9f5c93eb8cbabcf7_2_1
  answer = "Use the Force"
  count = 1138

Since it only grabs things of type "problem", it will not return results for
things like self/peer-assessments. Any Loncapa problem types will show up (so
multiple choice, text input, numeric, etc.)

Instead of crawling the course tree and instantiating the appropriate CapaModule
objects to grab state, this version draws directly from StudentModule. This lets
us skip a lot of processing and most importantly lets us generate the answer
distribution without causing side-effects (since XBlocks auto-save state). It
also lets us take advantage of a read-replica database if one is available, to
minimize locking concerns.

There are minor changes to the legacy dashboard around CSV charset encoding and
a change to OptionResponseXMLFactory to make it more unicode friendly. Answer
distribution output is now also sorted, to group together answers for the same
content piece.

Note that this does not introduce celery into the process. Answer distributions
are still only available for small courses.

This was originally created to fix [LMS-922], but it also addresses [LMS-811] and
possibly other areas in the legacy dashboard where CSV downloads break due to
character encoding issues.

Tweak language surrounding grade download button

Markhoeber/documentation/release notes 12 17 13

Update testing doc

Add missing image file, correct typos

Add template for the zooming image in Studio.

Add the missing TextInput_MultipleAnswer.gif file. Correct
capitalization of another image file name so it'll appear in the docs.

Fix formatting problem in Working with Video Components

Update Text Input problem type: Multiple correct responses are now
possible

Updated Jenkins scripts

Stub Server Port Conflicts and Refactor

Refactored stub services for style and DRY

Added unit tests for stub implementations

Updated acceptance tests that depend on stubs.

Updated Studio acceptance tests to use YouTube stub server; fixed failing tests in devstack.

Fix typos in Announcement template.

Reformat xml_importer.py to be more readable

Jarv/readme installation

accessibility

Markhoeber/documentation/analytics sprint 12

Studio doesn't do email changes, thus has no email reset template; thus, we must disable password/email-reset related tests when running with studio settings

wiki and user_id_map tables finalized

Several templates used a variable set by the user (the request host header).  This led to a vulnerability where an attacker could inject their domain name into these templates (i.e., activation emails).  This patch fixes this vulnerability.

LMS-532

Updates to video documentation

fixed image path

Updates to reflect new video component UI and uploading processes

Removed number from RN TOC

Move default DOC_STORE_CONFIG to common

Video: Update behavior of start/end time fields.

Fixed a few typos in Building a course document

Stop forcing video player’s speeds widget width

Workaround for "xhr.restore" failures.

Alex/lti fixes to release