Authorinfo is wrong with the docbook backend

[pilhuhn]

I have this input:

RHQ
===
Heiko W. Rupp <hwr@pilhuhn.de>
:Author Initials: HWR
:toc:
:icons:
:numbered:
:website: http://www.pilhuhn.de/hwr
:author: Heiko W. Rupp`

asciidoc creates

<bookinfo>
    <title>RHQ</title>
    <author>
        <firstname>Heiko</firstname>
        <othername>W.</othername>
        <surname>Rupp</surname>
        <email>hwr@pilhuhn.de</email>
    </author>
    <authorinitials>HWR</authorinitials>
</bookinfo>

(see the correct split into firstname and surname etc.

asciidoctor creates

<bookinfo>
  <title>RHQ</title>
  <date>2013-01-31</date>
  <author>
    <firstname>Heiko W. Rupp <hwr@pilhuhn.de></firstname>
  </author>
  <authorinitials>HWR</authorinitials>

[mojavelinux]

Fix uploaded, pending merge.