Annotation Tools: Add helper functions and fixed pep8/pylint errors

Small plugin fixes
Image Annotation Tool: create xmodule and install js files
Image Annotation Tool: Add static images for openseadragon navigation
Image Annotation Tool Fixes
- Added component to view

- Added correct images for OSD

- Fixed path to codemirror

- Tinymce fullscreen works now

- Pep8/Pylint Fixes

- Default image changed and added call to super
Image Annotation Tool: Add linkback functionality to image thumbnails

Changes requested in PR
Adding enrollment upgrade events
Merge pull request #3860 from edx/ahodges/documentation/DOC394

Ahodges/documentation/doc394
Hide beta dash Analytics score distribution widget behind feature flag

ENABLE_INSTRUCTOR_ANALYTICS flag is present to conditionally hide data
dependent on external analytics server installation
Show the menus at the top of the page.
Merge pull request #3831 from lduarte1991/lduarte-harvardx-image

Installing Image Annotation Tool for Upcoming June 2014 Course
ORA2 release-2014-05-23T16.59
Add 'forum_roles' endpoint to user_api

Expose a new endpoint to query a list of users based on a
role name (Moderator, Student, etc.) and a course_id.

This will initially be used by the notifier to send daily digest
messages to forum moderators.
Merge pull request #3863 from edx/sarina/feature-flag-analytics-dash

Hide beta dash Analytics tab behind feature flag
Merge pull request #3867 from edx/will/ora2-release-2014-05-23T16.59

ORA2 release-2014-05-23T16.59
Merge pull request #3676 from edx/f/forum-flag-digest

Add 'roles' endpoint to user_api
Extract opaque_keys into a separate library

[LMS-2571]
Move to OpaqueKey implementations from the external library

[LMS-2757]