[master] bc2083f Chapter on what a web accl is

[Per Buer]

commit bc2083f669f1c9f2decbcd440f9404c0bb54ebdf
Author: Per Buer <per.buer at gmail.com>
Date:   Fri Sep 7 15:20:26 2012 +0200

    Chapter on what a web accl is

diff --git a/doc/sphinx/tutorial/web_accelerator.rst b/doc/sphinx/tutorial/web_accelerator.rst
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+.. _tutorial-web_accelerator:
+
+What is a web accelerator
+-------------------------
+
+
+The problem
+-----------
+
+Application servers  er slow. They do lots of different things and
+they can sometimes take seconds to complete a web page.
+
+The solution
+------------
+
+Enter Varnish. It keeps a copy of the web pages that pass through
+it. If it finds that it can reuse these later so the server doesn't
+have to regenerate these it speeds things up.
+
+
+