Upcoming Events: YOU SHALL NOT SHIP

As per @ethitter and @jacklenox there’s some iffiness with recurrent
events at the moment that means it would be better to delay this until
2.9 and give it a bit more soak time.
Jetpack: Stats: Enable an interstitial message and improved spinner while loading stats.
Merge pull request #98 from martinremy/master

Jetpack: Stats: Enable an interstitial message and improved spinner whil...