update Piwik to version 2.16 (fixes #91)

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

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+# Pause/unpause
+
+This extension allows Mousetrap to be paused and unpaused without having to reset keyboard shortcuts and rebind them.
+
+Usage looks like:
+
+```javascript
+// stop Mousetrap events from firing
+Mousetrap.pause();
+
+// allow Mousetrap events to fire again
+Mousetrap.unpause();
+```

www/analytics/libs/bower_components/mousetrap/plugins/pause/mousetrap-pause.js

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+/**
+ * adds a pause and unpause method to Mousetrap
+ * this allows you to enable or disable keyboard shortcuts
+ * without having to reset Mousetrap and rebind everything
+ */
+/* global Mousetrap:true */
+Mousetrap = (function(Mousetrap) {
+    var self = Mousetrap,
+        _originalStopCallback = self.stopCallback,
+        enabled = true;
+
+    self.stopCallback = function(e, element, combo) {
+        if (!enabled) {
+            return true;
+        }
+
+        return _originalStopCallback(e, element, combo);
+    };
+
+    self.pause = function() {
+        enabled = false;
+    };
+
+    self.unpause = function() {
+        enabled = true;
+    };
+
+    return self;
+}) (Mousetrap);

www/analytics/libs/bower_components/mousetrap/plugins/pause/mousetrap-pause.min.js

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+Mousetrap=function(a){var c=a.stopCallback,b=!0;a.stopCallback=function(a,d,e){return b?c(a,d,e):!0};a.pause=function(){b=!1};a.unpause=function(){b=!0};return a}(Mousetrap);