allow rsyslog to be none
updating handlers list to conditionally include syslogger-remote
update export_all_courses management command to count and list all failed export courses
removing rake and  outdated references to it
Annotations Tools: Fixing major Firefox/Tinymce bug in annotations

 - fixed issue in Firefox where the init gets called multiple times

 - fixed spacing issues and added more comments

 - fixed indentation, added missing parens in comment, and fixed typo
Correct UnboundLocalError exception in student_migration_35
Text Annotation Tool: Safari Colored Highlights Bug Fix

 - fixed spacing
Merge pull request #4675 from lduarte1991/lduarte-harvardx-pr14

Annotations Tools: Fixing major Firefox/Tinymce bug in annotations
Merge pull request #4518 from lduarte1991/lduarte-harvardx-pr13

Text Annotation Tool: Safari Colored Highlights Bug Fix
BLD 1020: Easy access to Group Configurations page from Content Experiment component.
Merge pull request #4673 from edx/jarv/rsyslog-handler

Jarv/rsyslog handler
TinyMCE Plugin: Added media plugin to TinyMCE for the Annotation tool

- fixed missing media and link buttons on image

 - fixed a CSS issue with the sharing button
Merge pull request #4613 from edx/jmclaus/easy-access-group-configurations-page

BLD 1020: Easy access to Group Configurations page from Content Experiment component.
Merge pull request #4698 from mitocw/cg/fix_student_migration_35

Correct UnboundLocalError exception in student_migration_35
Merge pull request #4250 from edx/zub/story/listallexportfaildcourses

update export_all_courses management command to count and list all faile...
Request IFRAME API every time with https scheme.
Merge pull request #4717 from edx/alex/fix_test

Request IFRAME API every time with https scheme.
Merge pull request #4634 from edx/clytwynec/removing_remaining_rake_references

removing rake and  outdated references to it
Merge pull request #4687 from lduarte1991/lduarte-harvardx-pr16

TinyMCE Plugin: Added media plugin to TinyMCE for the Annotation tool
Replace unit page with the container page.

STUD-1754