Fix IE7 bug on isCrossDomain check

Author: rafaelfranca

vendor/assets/javascripts/jquery_ujs.js

@@ -176,10 +176,14 @@
         // This is a workaround to a IE bug.
         urlAnchor.href = urlAnchor.href;
 
-        // Make sure that the browser parses the URL and that the protocols and hosts match.
-        return !urlAnchor.protocol || !urlAnchor.host ||
-          (originAnchor.protocol + "//" + originAnchor.host !==
-            urlAnchor.protocol + "//" + urlAnchor.host);
+        // If URL protocol is false or is a string containing a single colon
+        // *and* host are false, assume it is not a cross-domain request
+        // (should only be the case for IE7 and IE compatibility mode).
+        // Otherwise, evaluate protocol and host of the URL against the origin
+        // protocol and host
+        return !(((!urlAnchor.protocol || urlAnchor.protocol === ':') && !urlAnchor.host) ||
+          (originAnchor.protocol + "//" + originAnchor.host ===
+            urlAnchor.protocol + "//" + urlAnchor.host));      //
       } catch (e) {
         // If there is an error parsing the URL, assume it is crossDomain.
         return true;