Add credits for London Datastore and Ordnance Survey

views/layout.haml

@@ -31,16 +31,23 @@
         %p
           %a{ :href => '/about' } About this website
         %p
-          %br
+        %p
           An independent website designed by
           %a{ :href => "http://adrianshort.org/" }<
             Adrian Short
           %a{ :href => "https://twitter.com/adrianshort"}<
             @adrianshort
-          with data from 
+        %p  
+          Powered by data from 
           %a{ :href => "http://www.sutton.gov.uk/" }<
             Sutton Council
-          
+          , 
+          %a{ :href => "http://data.london.gov.uk/"}
+            London Datastore
+          and
+          %a{ :href => "http://www.ordnancesurvey.co.uk/business-and-government/products/code-point-open.html" }<
+            Ordnance Survey          
+
   <script type="text/javascript">
   var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
   document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));