Added RenderTarget and RenderTarget2D classes to the XFX::Graphics namespace
Added Internal StorageDeviceAsyncResult class to the XFX::Storage namespace to aid in the implementation of the Guide.
Added Guide::BeginShowMessageBox and Guide::EndShowMessageBox methods
Began fixing comments to properly show up in IntelliSense
Now, the only thing keeping XFX from a full compile is my stupid attempt at Asynchronous IO. Will look at that, but most likely, I will comment it out and just get a new Demo out before New Year.
