Fix compatibility with express 3

lib/connect-cachify.js

@@ -51,9 +51,18 @@ exports.setup = function (assets, options) {
         m = req.url.match(new RegExp(fmt)),
         true_path, exists;
 
-    resp.local('cachify_js', cachify_js);
-    resp.local('cachify_css', cachify_css);
-    resp.local('cachify', cachify);
+    if (typeof resp.local === 'function') {
+      resp.local('cachify_js', cachify_js);
+      resp.local('cachify_css', cachify_css);
+      resp.local('cachify', cachify);
+    }
+    else if (typeof resp.locals === 'function') {
+      resp.locals({
+        cachify_js: cachify_js,
+        cachify_css: cachify_css,
+        cachify: cachify
+      });
+    }
     if (m && m.index === 0) {
       // 10 first characters of md5 + 1 for slash
       true_path = req.url.slice(prefix.length + 11);