Release Notes week of 9/8-9/11/2015

See the Release Notes Rotation for task assignments: https://openedx.atlassian.net/wiki/display/DOC/Release+Notes+Rotation

Acceptance Criteria:

• help tested on studio.stage.edx.org (https://openedx.atlassian.net/wiki/display/DOC/Online+Help+Testing+Script)

• Release Notes merged

• release notes and all other affected guides rebuilt in RTD (https://readthedocs.org/dashboard/)

• Date on docs.edx.org changed (https://openedx.atlassian.net/wiki/display/DOC/Updating+the+docs.edx.org+release+date)

• portal announcement made (http://partners.edx.org/announcements)

• clone this story, add its number to the Release Notes Rotation for next week, and assign to that writer

When writing release notes, keep these frequently requested features in mind.

• include cross references from feature descriptions to the pertinent new sections of the guide(s)

• be sure to indicate when a change affects students immediately, without requiring the feature to be enabled (for example, changes to the discussion UX)