Added rake commands for devstack
Add info about template for Checkbox problem type

Change text to "click Checkboxes on the Common Problem Types tab" and
add image of checkbox button
Correct minor formatting error
Added missing slash to avoid 302 when calling /notification_prefs/status
Add JSInput template information

Update Advanced Problems page with Custom JavaScript Display and
Grading (JS Input) problem info. Delete separate page for JS Input
problems. Update Appendix F with new code for sample JS Input problem.
Presplit stack diagram
Locator as prime repr
Update JS Input to reflect new template in Studio

Update Advanced Problems file and Appendix F
Doc update for changes to course outline

For STUD-1034
Add & to contents to verify that import/export still works.

Part of STUD-91
Add acceptance test for behavior when & is in problem xml.

Part of STUD-91
Added file pagination info

For files & uploads page.  stud-1034
Updated topic Testing Your Course for new outline page

Updated some text and all new images
Subsection grading changed

Changed terminology to not refer to setting grading policy for a
subsection, but selecting an assignment type
Find Files doc update

clarified sentence on what's shown at top of page
Updated change log

Added new changes in Mistletoe sprint to change log.
Moved change log

Moved change log to beginning of document.
added SPOC info

For stud-1019
Miscellaneous fixes to strings found during i18n work.
Fixes to Translator comments found while debugging the i18n pipeline.