Merge pull request #34 from mozilla/ie11

Fix the UA sniffing to handle IE11

winchan.js

@@ -14,15 +14,24 @@
     else if (w.removeEventListener) w.removeEventListener(event, cb, false);
   }
 
+
   // checking for IE8 or above
   function isInternetExplorer() {
     var rv = -1; // Return value assumes failure.
+    var ua = navigator.userAgent;
     if (navigator.appName === 'Microsoft Internet Explorer') {
-      var ua = navigator.userAgent;
       var re = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
       if (re.exec(ua) != null)
         rv = parseFloat(RegExp.$1);
     }
+    // IE > 11
+    else if (ua.indexOf("Trident") > -1) {
+      var re = new RegExp("rv:([0-9]{2,2}[\.0-9]{0,})");
+      if (re.exec(ua) !== null) {
+        rv = parseFloat(RegExp.$1);
+      }
+    }
+
     return rv >= 8;
   }