[PLib Test App] First version of PLib test app
- Windows Store at first; more changes to come
[PLib Test App] Fixing tests to accomodate behavioral differences
- Mostly regarding immutability of untyped values passed to Insert or
  Update
[PLib Test App] WP8 App (start)
- Also updated NuGet package reference for PLib assemblies
[PLib Test App] Added linked files to WP8 project