update Piwik to version 2.16 (fixes #91)

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

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+# Bind Dictionary
+
+This extension overwrites the default bind behavior and allows you to bind multiple combinations in a single bind call.
+
+Usage looks like:
+
+```javascript
+Mousetrap.bind({
+    'a': function() { console.log('a'); },
+    'b': function() { console.log('b'); }
+});
+```
+
+You can optionally pass in ``keypress``, ``keydown`` or ``keyup`` as a second argument.
+
+Other bind calls work the same way as they do by default.