Merge pull request usablica#385 from Chris-Kim/patch-1

Transform is 'undefined' in IE 8

Author: afshinm

intro.js

@@ -956,7 +956,7 @@
       var zIndex = _getPropValue(parentElm, 'z-index');
       var opacity = parseFloat(_getPropValue(parentElm, 'opacity'));
       var transform = _getPropValue(parentElm, 'transform') || _getPropValue(parentElm, '-webkit-transform') || _getPropValue(parentElm, '-moz-transform') || _getPropValue(parentElm, '-ms-transform') || _getPropValue(parentElm, '-o-transform');
-      if (/[0-9]+/.test(zIndex) || opacity < 1 || transform !== 'none') {
+      if (/[0-9]+/.test(zIndex) || opacity < 1 || (transform !== 'none' && transform !== undefined)) {
         parentElm.className += ' introjs-fixParent';
       }