fix callbacks calls on crossdomain requests for IE

misc/js/pushstream.js

@@ -237,6 +237,17 @@ Authors: Wandenberg Peixoto <wandenberg@gmail.com>, Rogério Carvalho Schneider
 
       settings.xhr = xhr;
 
+      if (window.XDomainRequest && (xhr instanceof window.XDomainRequest)) {
+        xhr.onload = function () {
+          if (settings.afterReceive) { settings.afterReceive(xhr); }
+          if (settings.success) { settings.success(xhr.responseText); }
+        };
+
+        xhr.onerror = xhr.ontimeout = function () {
+          if (settings.afterReceive) { settings.afterReceive(xhr); }
+          if (settings.error) { settings.error(xhr.status); }
+        };
+      } else {
         xhr.onreadystatechange = function () {
           if (xhr.readyState === 4) {
             Ajax.clear(settings);
@@ -248,6 +259,7 @@ Authors: Wandenberg Peixoto <wandenberg@gmail.com>, Rogério Carvalho Schneider
             }
           }
         };
+      }
 
       if (settings.beforeOpen) { settings.beforeOpen(xhr); }