update Piwik to version 2.16 (fixes #91)

www/analytics/libs/bower_components/mousetrap/plugins/global-bind/README.md

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+# Global Bind
+
+This extension allows you to specify keyboard events that will work anywhere including inside textarea/input fields.
+
+Usage looks like:
+
+```javascript
+Mousetrap.bindGlobal('ctrl+s', function() {
+    _save();
+});
+```
+
+This means that a keyboard event bound using ``Mousetrap.bind`` will only work outside of form input fields, but using ``Moustrap.bindGlobal`` will work in both places.
+
+If you wanted to create keyboard shortcuts that only work when you are inside a specific textarea you can do that too by creating your own extension.