grim/purple-objects-docbook

updated the title of the conversation hierarchies to be a bit more specific
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">
<book id="purple-objects" xmlns:xi="http://www.w3.org/2003/XInclude">
<bookinfo>
<title>Purple Objects Overview</title>
</bookinfo>
<xi:include href="about.xml"/>
<xi:include href="todo.xml"/>
<xi:include href="graphs.xml"/>
<xi:include href="plugins.xml"/>
<xi:include href="plugin-loaders.xml"/>
</book>