initial draft

@mhoeber , this is an early take as I am waiting on replies from a couple of people, but I'd appreciate your sense of whether I've missed anything that's on the release page: https://edx-wiki.atlassian.net/wiki/display/ENG/Release+Page%3A+2014-06-24
only exact matches for the username are returned.  i think it's accurate as written, but you could alternatively s/for usernames/by username/ and s/other users/another user/ to make this more explicit.