add a list of project using django-pipeline

docs/index.rst

@@ -22,6 +22,7 @@ Table Of Contents
    templates
    storages
    signals
+   using
    changelog
 
 Indices and tables

docs/using.rst

+.. _ref-using:
+
+====================
+Sites using Pipeline
+====================
+
+The following sites are a partial list of people using Pipeline.
+
+Are you using pipeline and not being in this list ? Drop us a line. 
+
+20 Minutes
+----------
+
+For their internal tools : http://www.20minutes.fr
+
+Pitchfork
+---------
+
+For their main website : http://pitchfork.com
+
+The Molly Project
+-----------------
+
+Molly is a framework for the rapid development of information and service
+portals targeted at mobile internet devices : http://mollyproject.org
+
+It powers the University of Oxford's mobile portal : http://m.ox.ac.uk/
+
+Croisé dans le Métro
+--------------------
+
+For their main and mobile website :
+
+* http://www.croisedanslemetro.com
+* http://m.croisedanslemetro.com
+
+Squibcakes
+----------
+
+For their main website : http://squibcakes.com
\ No newline at end of file