Add NuGet restore
Added FileTypeAssocations for .wmv in app manifest
Library: added ContainsFileAsync("lib.json") to Library.Load()
StorageHelper: added support for peering into RemovableDevices.
Note: not guaranteed to have access to said StorageFile.
HubPage.xaml: mediaelement no long autoplays.
Utilizes a PosterSource.
Pressing a video previews it.
Some changes to csproj for NuGet Restore