Updating WordPress-iOS-Analytics to 0.0.3.
Adding in additional Mixpanel tracking code for stats.

* Stats - Opened Web Version
* Stats - Tapped Bar Chart
* Stats - Scrolled to Bottom
Removed analytics for WPAnalyticsStatNotificationPerformedAction.

We dumped this from the main analytics repo so we needed to remove
the instances where the code would track this.
Merge pull request #2277 from wordpress-mobile/issue/add-in-stats-analytics

Add in more analytics to stats