Grading types should not allow empty field for "Total Number" and "Numbe...

STUD-988

Fix video controls on iPad.

Update changelog with studio marketing site feature

Set the registry for node in prereqs

Removed extra file

Removing long-file-name, stray file from earlier commit

Add instructor notes to document

Change formatting for notes to instructor from table to warning

Change course_id to package_id

Add base package to edxapp page object setup.py

corrects typo in legacy.py (LMS-1675)

Moved bok-choy page objects and setup.py to common/test/bok_choy

Studio HTTPS Fonts (re-enable)

To acknowledge his help with refactoring URLs in our CSS to be
protocol-relative

TinyMCE: Updating Google Font Syntax

on new Locators to make it clear that they have a different syntax
than Location.course_id altho they represent the same info.

Add template instructions for course teams, letting them know where
they should modify the text according to their courses

Fix (re-implement) answer distribution report generation.

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.

Add handler_url usable by descriptors

* matches syntax used when importing Open Sans in LMS/Studio
* simplifies and moves syntax to modern Google Web Font standards
* maintains the http/https agnostic work

script bombs if comments include unicode

[LMS-1614]

Add acceptance test of image response

Add acceptance tests of GST module

Add acceptance tests of the conditional module

Add acceptance tests of Annotatable module

LMS: Use Open Sans Typeface via Google Web Fonts

Studio: Updating Google Font Syntax

Properly format errors/warnings.

Minor i18n improvements