20 - Initial GridViewer Demo Application 

Issue 20: The GridViewer Demo is stable and working well enough to be pulled into the MSV-Project repo. Hence I'm posting this pull request in case anyone wants to review it. As mentioned under issue 20, we're going to extend it and offer better data, and I am aware that a simple test of the demo classes could be added.

IMPORTANT NOTE! This commit includes both other Pull Requests I have pending (13-msvVTKDataFileSeriesReader, 21-msvVTKEmbeddedProbeFilter) so I recommend reviewing and pulling them first if possible.

Issue 20