Visual Studio App Center feature updates

[Visual Studio App Center](https://www.visualstudio.com/app-center/) is mission control for your mobile apps Bring your apps written in any language to Visual Studio App Center’s cloud and lifecycle services, and you’ll get faster release cycles, higher-quality apps, and the time and data to focus on what users want. New features in Visual Studio App Center that empower developers to ship mobile apps more frequently, at higher-quality and with greater confidence include support for Universal Windows Platform apps, integration with Bitbucket and VSTS repositories, push notifications integrated into Mobile Center analytics, and support for Apple’s XCUITest user interface testing framework. Read more about [these new features and Visual Studio App Center](https://www.visualstudio.com/app-center/). * Features