Add "Hashing for the homeless" post

Also add Author to post metadata template.

Cross-posted to
http://anabasis.dunck.us/2013/06/03/hashing-for-the-homeless/

Change-Id: I950177dcab29be2772e694049502de7e9a04ba70
Reviewed-on: https://gerrit.causes.com/23277
Reviewed-by: Jeremy Dunck <jeremy.dunck@causes.com>
Reviewed-by: Aiden Scandella <aiden@causes.com>
Tested-by: Jeremy Dunck <jeremy.dunck@causes.com>