Reorg of Research Guide

To remove XML info that’s in course staff doc now.

doc-332
Merge pull request #3581 from edx/markhoeber/documentation/doc-332

Markhoeber/documentation/doc 332
Merge pull request #3569 from edx/gprice/remove-cs-email

Remove email field from CS client user object
Add the "VERIFIED_CERTIFICATES" toggle on dashboard
Renaming enrolled to active
flake8 cleanup
Merge pull request #3503 from edx/db/process-updates

Reorganize information in CONTRIBUTING.rst, link to ReadTheDocs
Address Christina's review comments
These files are not being used.
Reset the jenkins python virtualenv before test runs.
Make course ids and usage ids opaque to LMS and Studio [partial commit]

This commit makes the embargo.tests module a real python module.

These keys are now objects with a limited interface, and the particular
internal representation is managed by the data storage layer (the
modulestore).

For the LMS, there should be no outward-facing changes to the system.
The keys are, for now, a change to internal representation only. For
Studio, the new serialized form of the keys is used in urls, to allow
for further migration in the future.

Co-Author: Andy Armstrong <andya@edx.org>
Co-Author: Christina Roberts <christina@edx.org>
Co-Author: David Baumgold <db@edx.org>
Co-Author: Diana Huang <dkh@edx.org>
Co-Author: Don Mitchell <dmitchell@edx.org>
Co-Author: Julia Hansbrough <julia@edx.org>
Co-Author: Nimisha Asthagiri <nasthagiri@edx.org>
Co-Author: Sarina Canelake <sarina@edx.org>

[LMS-2370]
Adding additonal path to search for git information on sysadmin dashboard
When viewing the sysadmin dashboard courses tag, we also search the git
repository directory in addition to the DATA_DIR to try and find
the course git repo to get hash, last commit, and last editor information
for each loaded course if available.
put google analytics in quotation marks in linkedin email template
Merge pull request #3578 from edx/db/500-template-on-studio

Show error page templates on Studio
Merge pull request #3594 from edx/christina/delete-dead-files

These files are not being used.
Merge pull request #3202 from edx/talbs/lms-dashboard-trackstatus

LMS: Show Enrollment Type on Dashboard
Adding additional fields for certificate mode
Filter just downloadable certs for report
Rebalance CMS acceptance test shards
Merge pull request #3593 from edx/han/cert-report

Certificate report improvements