Replace ZeroClipboard with Clipboard.js to remove flash dependency

examples/resources/common.js

@@ -1,12 +1,9 @@
 (function() {
   var copyButton = document.getElementById('copy-button');
   if (copyButton) {
-    var data = document.getElementById('example-source').textContent;
-    new ZeroClipboard(copyButton).on('copy', function(event) {
-      event.clipboardData.setData({
-        'text/plain': data,
-        'text/html': data
-      });
+    var clipboard = new Clipboard('#copy-button');
+    clipboard.on('success', function(e) {
+      e.clearSelection();
     });
   }