BLD-1091: Hide user_partitions from Advanced settings.
Update install_prodstack.rst

After installing Fullstack via Vagrant, the user needs to know the credentials to login to edX
Merge pull request #4555 from edx/anton/remove-experiments-from-advanced-settings

Remove user_partitions from advanced settings
Merge pull request #4507 from dmin7b5/patch-1

Update install_prodstack.rst
BLD-1104: List units that use group configuration.
Merge pull request #4528 from edx/jmclaus/edit-group-configurations-usage

BLD-1104: List units that use group configuration.
Instructors can view previously sent email content

Previously on the send email page of the instructor dashboard, instructors could only view task information about emails they've sent for their course in the past.
In addition to this, I've now added the ability to see the content of all previously sent emails. A "show email content history" button has been added to the page. When clicked, a table displaying the subject line, number of emails sent, and date/time of submission for each previously sent email is created. An instructor can then click on any subject line to see the content of that email, displayed in a modal window that appears on the page. The window is also equipped with a "copy email body to editor" button, which copies the emails contents to the tinyMCE editor, so that an instructor can easily resend an email that they've sent in the past.