update Piwik to version 2.16 (fixes #91)

www/analytics/libs/bower_components/mousetrap/plugins/README.md

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+# Plugins
+
+Plugins extend the functionality of Mousetrap.  To use a plugin just include the plugin after mousetrap.
+
+```html
+<script src="mousetrap.js"></script>
+<script src="mousetrap-record.js"></script>
+```
+
+## Bind dictionary
+
+Allows you to make multiple bindings in a single ``Mousetrap.bind`` call.
+
+## Global bind
+
+Allows you to set global bindings that work even inside of input fields.
+
+## Pause/unpause
+
+Allows you to temporarily prevent Mousetrap events from firing.
+
+## Record
+
+Allows you to capture a keyboard shortcut or sequence defined by a user.