Credit funders

An Initial step toward #114. (I’d like to incorporate their logos and
take this out of the fine print.)

public/grid/index.html

@@ -62,11 +62,12 @@ <h2 class="text-center">
       <div class="row">
          <div class="col-xs-12 col-sm-8 col-sm-offset-2 col-md-10 col-md-offset-1 main">
           <footer>
-            <p><small>Created by <a href="https://usopendata.org/">U.S. Open Data</a>. All data published under
-            <a href="https://creativecommons.org/publicdomain/zero/1.0/">the CC0 license</a>, all other
-            contents published under <a href="https://opensource.org/licenses/MIT">the MIT license</a>.
-            <a href="https://github.com/opendata/Open-Data-Census/">Pull requests cheerfully accepted on
-            GitHub</a>.</small></p>
+            <p><small>Created by <a href="https://usopendata.org/">U.S. Open Data</a>, with funding
+            by the <a href="http://knightfoundation.org/">John S. and James L. Knight Foundation</a>
+            and the <a href="https://www.shuttleworthfoundation.org/">Shuttleworth Foundation</a>.
+            All data published under <a href="https://creativecommons.org/publicdomain/zero/1.0/">the
+            CC0 license</a>, all other contents published under
+            <a href="https://opensource.org/licenses/MIT">the MIT license</a>. <a href="https://github.com/opendata/Open-Data-Census/">Pull requests cheerfully accepted on GitHub</a>.</small></p>
           </footer>
         </div>
       </div>