Revert "remove pointer events test as it's not reliable. ref #80"

It's totally fine.

This reverts commit 284a859.

feature-detects/css-pointerevents.js

@@ -0,0 +1,18 @@
+// developer.mozilla.org/en/CSS/pointer-events
+// github.com/ausi/Feature-detection-technique-for-pointer-events
+Modernizr.addTest('pointerevents', function(){
+    var element = document.createElement('x'),
+        documentElement = document.documentElement,
+        getComputedStyle = window.getComputedStyle,
+        supports;
+    if(!('pointerEvents' in element.style)){
+        return false;
+    }
+    element.style.pointerEvents = 'auto';
+    element.style.pointerEvents = 'x';
+    documentElement.appendChild(element);
+    supports = getComputedStyle &&
+        getComputedStyle(element, '').pointerEvents === 'auto';
+    documentElement.removeChild(element);
+    return !!supports;
+});