Welcome page text edits
Merge pull request #3896 from edx/will/install-ease-and-requirements

Install EASE and requirements
Merge pull request #3841 from edx/fix/large-email-queries-2

Fix/large email queries 2
Move to OpaqueKey implementations from the external library

[LMS-2757]
Fix the title of edit modals from the unit page.
show a friendly message for an empty course rather than an error page
Fix location.url [LMS-2786]
Merge pull request #3931 from edx/sarina/fixup-external-opaque-keys-impls

Use external OpaqueKey implementations
Merge pull request #3929 from edx/sarina/lms-2786

Fix location.url [LMS-2786]
Merge pull request #3754 from theJohnnyBrown/empty-course-error

show a friendly message for an empty course rather than an error page
Temporarily disable capa name masking

There is a bug I need to fix when a student re-visits a problem that they
had solved previously without masking enabled, their old state does not
load correclty.

It's simplest to turn off masking now, and re-enable it with the whole fix.

The change here is a small deletion to remove the masking=True logic, and more
lengthy changes to adjust the tests.
Add span tag.
Merge pull request #3917 from edx/oleg/add-span-tag-matlab

Accept span tag from xqueue. BLD-1006.
Run bundle clean after bundle install

Running it beforehand was resulting in a corrupted state
if it was the first time bundle install was run.
Update EASE in edx-platform requirements
Merge pull request #3196 from mtyaka/enrollment-emails-http

Don't hardcode https protocol in enrollment emails.
Merge pull request #3933 from edx/andya/edit-container-fixes

Fix the title of edit modals from the unit page.
removes qualaroo from studio (STUD-1684)
Delete orphans was trying to get non-existent 'draft' modulestore
Merge pull request #3907 from lduarte1991/lduarte-harvardx-image2

Annotation Tools: Load Tinymce in student_view