edx/edx-platform — pull request #5089 by lamagnifica (2014-09-05 00:59:09+00:00)
Title: Corrections to guides for 4 Sep release

Items repaired:
- Pin_discussion.png file in wrong directory
- Discussion_filters.png image in discussion_students unreadable, replaced
- updated release date in Research guide change log
- updated release date in Course Author’s guide change log
- updated “History” dates for fields added to research guide