Add framework for additional worker docs.

Adds an "about" page as well as a code walkthrough page with
some initial content.

doc/worker/about.rst

@@ -0,0 +1,27 @@
+Description
+===========
+
+Purpose
+-------
+
+   The Libra Gearman worker does cool stuff.
+
+Design
+------
+
+   The design rocks.
+
+Gearman Messages
+^^^^^^^^^^^^^^^^
+
+   Yup, we got 'em.
+
+Pluggable Drivers
+^^^^^^^^^^^^^^^^^
+
+   HAProxy is one.
+
+HAProxy OS Support
+^^^^^^^^^^^^^^^^^^
+
+   Only Ubuntu now, but designed for others to be easily implemented.

doc/worker/code.rst

@@ -0,0 +1,34 @@
+Code Walkthrough
+================
+
+Here we'll highlight some of the more important code aspects.
+
+Gearman Task
+------------
+.. py:module:: libra.worker.worker
+
+.. py:function:: lbaas_task(worker, job)
+
+   This is the function executed by the Gearman worker for each message
+   retrieved from a Gearman job server.
+
+Server Class
+------------
+
+.. py:module:: libra.worker.worker
+
+.. py:class:: Server(logger, servers, reconnect_sleep)
+
+   This class encapsulates the server activity once it starts in either
+   daemon or non-daemon mode and all configuration options are read.
+
+   .. py:method:: main()
+
+      The one and only method in the class and represents the primary
+      function of the program. The Gearman worker is started in this method,
+      which then executes the :py:func:`lbaas_task` function for each message.
+      It does not exit unless the worker itself exits.
+
+      If all Gearman job servers become unavailable, the worker would
+      normally exit. This method identifies that situation and periodically
+      attempts to restart the worker in an endless loop.

doc/worker/index.rst

@@ -4,4 +4,6 @@ Libra Gearman Worker
 .. toctree::
    :maxdepth: 2
 
-   config
+   about
+   config
+   code