Created folders.

Folders only in Solutionexplorer. Still flat in Windowsexplorer.
Uploading to folder works.
Added unit testing (and mocking) of file upload.

Still don't test that the code really saves a file.
Managed to check the call of SaveAs.

So now I am satisfied with unit tests of Index. For now.
Temp checkin.
Moved projects into Test and Presentation.
Temp checking: unit test of HomeController.Index now works.
Temp checkin: made a roted repository path setting.