Update System.Windows.Interactivity.dll
Install Microsoft.Bcl.Async into the Demo so we can get rid of ContinueWith
Fix whitespace
Fix the .NET45 build of the demo
Write an explanation how we have async/await support on .NET 4.0
Merge pull request #854 from MahApps/bcl-async

Install Microsoft.Bcl.Async into the Demo so we can get rid of ContinueWith
Initial implementation of modal flyouts.
Respect the current theme for the overlay color.
Added modal Flyout support to CleanWindowStyle.
Add the latest features to the changelog
Merge pull request #831 from seniorquico/System.Windows.Interactivity

Update System.Windows.Interactivity.dll