Fix TypeError in SyntheticEvent

I suspect that plugins are modifying `Object.prototype` which is causing TypeErrors in `SyntheticEvent`. Let's fix it.
Fix Clicks in Mobile Safari

This works around a bug with listening to clicks using event delegation on Mobile Safari using an event plugin.

NOTE: We don't enable touch events by default, so I don't know if would want to inject this plugin by default. In fact, I'm not sure what our strategy is at all for when to invoke `React.useTouchEvents(true)`.