addes files to shared project
updated DirectXTK to version July 15, 2014 and set references for WP81 & W81
handle file activation, added tiles
Adapted ViewModel Tests and API-Test
Fixed playing sound in SpriteEditorView
Modified test files. Added command bar. Added DirectX integration in XAML.
Removed and renamed folders
Fixed wrong namespaces
Refactored ViewModel-tests which use webCommunication-service
Added methods for class "Direct3DBackground".
Fixed FileAssociations and improved program startup
Added better handling of image thumbnails
Merge TFS Changeset 1489