Added IE version check helper function

lib/helpers/ieVersion.js

+'use strict';
+
+/**
+ * https://gist.github.com/padolsey/527683
+ *
+ * A short snippet for detecting versions of IE in JavaScript
+ * without resorting to user-agent sniffing
+ *
+ * @returns {Number|undefined} Number of IE version (5-9), otherwise undefined
+ */
+module.exports = function ieVersion() {
+  var undef;
+  var v = 3;
+  var div = document.createElement('div');
+  var all = div.getElementsByTagName('i');
+
+  while ((
+    div.innerHTML = '<!--[if gt IE ' + (++v) + ']><i></i><![endif]-->',
+    all[0]
+  ));
+
+  return v > 4 ? v : undef;
+};