updating commit
Merge pull request #2817 from edx/jarv/update-js-draw-commit

updating commit
Allow HTML in grader messages.
Reformatted event type info to get it out of wide tables
Merge pull request #2800 from edx/ahodges/documentation/reformatevents

Reformatted event type info to get it out of wide tables
xblock-mentoring: Add repository to requirements & installed apps

Adding to installed Django applications is required due to the use
of a Django model by the XBlock
Activate XBlocks by default in LMS & Studio
Merge pull request #2814 from gsehub/xblock-mentoring

xblock-mentoring: Add repository to requirements & installed apps
Merge pull request #2818 from edx/alex/allow_html_in_grader_msg

Allow HTML in grader messages.
Prevent reflected XSS in instructor dashboard.
Use display_name_with_default instead of display_name.
Increase max-width for breadcrumb trail.
Improve code clarity.
split testing support in the LMS.

Adds a split_test_module XModule, that can choose one of its children
to display, based on a get_condition_for_user API added to the runtime.

To test, add something like this to an xml course, or make equivalent
 tweaks in mongo.

 <vertical url_name="split_test_vert">
    <split_test url_name="split1" experiment_id="0" condition_id_to_child='{"0": "i4x://MITx/6.00x/html/split_test_cond0", "1": "i4x://MITx/6.00x/html/split_test_cond1"}'>
       <html url_name="split_test_cond0">condition 0</html>
       <html url_name="split_test_cond1">condition 1</html>
    </split_test>
  </vertical>

Also needs an experiment configured in the course policy json: e.g.

        "user_partitions": [{"id": 0,
                                      "name": "Experiment 0",
                                      "description": "Unicorns?",
                                      "version": 1,
                                      "groups": [{"id": 0,
                                                        "name": "group 0",
                                                        "version": 1},
                                                        {"id": 1,
                                                        "name": "group 1",
                                                        "version": 1}]}]

(This particular snippet will work inside a course with org MITx
 and course name 6.00x)

Co-Author: Sarina Canelake <sarina@edx.org>
Co-Author: Julia Hansbrough <julia@edx.org>
Co-Author: Diana Huang <diana@edx.org>
Co-Author: Calen Pennington <cale@edx.org>

[LMS-2095]
Add course tags to all events where a course-id can be extracted from the url

[LMS-2105]
Track renders of split_test children

[LMS-2098]
Add tests and clean up A/B testing

Also fixes STUD-1351
Merge pull request #2807 from edx/christina/containers

Support xblocks with children on the container page.
Fixes tinymce bug:
    On using the image plugin, the image was not appearing in the
    visual editor immediately after using the command.

    Selenium test added.
making mixed ms capable of front ending all modulestores for most operations including CRUD
STUD-600