Release notes 6/16/2014

@mhoeber @lamagnifica Please review. Built HTML version at http://draft-release-notes-6-16.readthedocs.org/en/latest/06-16-2014.html.
actually we should add another bullet for open edx install/config guide:  http://edx.readthedocs.org/projects/edx-installing-configuring-and-running/en/latest/  and add this as a change