[VTK-4720] Resolve previous locations on 404
[VTK-4720] Resolve previous locations on 404

Add resolver for tracking previous locations when request comes in for
a (currently) non-existent resource. Presents a list of resources that
have previously occupied the URI.

vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk