Document compositon of Zope w/ other WSGI apps.

[ci skip]
(cherry picked from commit 81e1fc07)

docs/WSGI.rst

@@ -172,3 +172,34 @@ Start the WSGI Server
    Starting server in PID 24934.
    serving on http://127.0.0.1:8080
 
+Running Other Applications in the same WSGI Server Process
+----------------------------------------------------------
+
+You can use any of the normal ``Paste`` WSGI features to combine Zope and
+other WSGI applications inside the same server process.  E.g., the following
+configuration uses the
+`composite application <http://pythonpaste.org/deploy/#composite-applications>`_
+support offered by ``PasteDeploy`` to host Zope at the ``/`` prefix,
+with static files served from disk at ``/static``:
+
+.. code-block:: ini
+
+   [app:zope-app]
+   use = egg:Zope2#main
+   zope_conf = %(here)s/zope.conf
+
+   [pipeline:zope-pipeline]
+   pipeline =
+       egg:paste#evalerror
+       egg:repoze.retry#retry
+       egg:repoze.tm2#tm
+       zope
+
+   [app:static]
+   use = egg:Paste#static
+   document_root = %(here)s/static
+
+   [composite:main]
+   use = egg:Paste#urlmap
+   / = zope-pipeline
+   /static = static