ui-log: Add "log-order" option for controlling commit ordering

[Jason A. Donenfeld]

> commit 6c0717a9e1606c976821eff3169f92b24ff3aea7
> Author: Tobias Bieniek <Tobias.Bieniek at gmx.de>
> Date:   Sat Oct 13 16:10:30 2012 +0200
>     ui-log: Add "log-order" option for controlling commit ordering
>
>     This makes it possible to use strict commit date ordering or strict
>     topological ordering by passing the corresponding flags to "git log".

Committed into a branch here:
http://git.zx2c4.com/cgit/commit/?h=tb/log-order

It will likely be included in the upcoming release.