grim/purple-objects-docbook

Added a lot of description to the graphs page including and example class as well as an example enum.
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">
<chapter id="conversations">
<title>Conversations</title>
<imageobject>
<imagedata fileref="graphs/conversations-objects.png"/>
</imageobject>
<imageobject>
<imagedata fileref="graphs/conversations-interfaces.png"/>
</imageobject>
</chapter>