Expose a bunch of Author things to QML (and add displayName)

Display name in this case is a failthrough system to get a useable
name to display to the user, so we can have that consistent. To see
the issue which ACBF faces on this topic, please (re)read:
http://www.kalzumeus.com/2010/06/17/falsehoods-programmers-believe-about-names/