Remove AnalyticsEventPlugin

We only ever had a couple internal users of this, and now we have none. Removing it from the repo for cleanliness.

Author: sophiebits

src/renderers/dom/client/eventPlugins/AnalyticsEventPluginFactory.js

@@ -30,7 +30,6 @@ var DefaultEventPluginOrder = [
   keyOf({ChangeEventPlugin: null}),
   keyOf({SelectEventPlugin: null}),
   keyOf({BeforeInputEventPlugin: null}),
-  keyOf({AnalyticsEventPlugin: null}),
 ];
 
 module.exports = DefaultEventPluginOrder;