Use a custom LinkMovementMethod class that handles Stats links.
Fix a leaked window issue.
Fix style issues
Do not inherit from AuthenticatedWebViewActivity, but use WebViewActivity. The former needs a valid currentBlog set in the app, but there could be situations in which currentBlog is null.
Merge pull request #1521 from wordpress-mobile/issue/1517-open-stats-links-from-notification

Open Stats links by using the in-app browser from notifications