BUG: Corrected bug in the freesurfer queries
ENH: Forced the datatype in the vtk interface
BUG: Fixed bug in testing
DOC: Fixed documentation issues and added a link to the example dataset in MIDAS
DOC: Changed the SVG image for a PNG one for broader compatibility
ENH: Added backwards compatibility for python 2.6
ENH: Updated gitignore
COMP: Backward compatibility with numpy 1.4
ENH: Update to allow VTK6 or VTK5 writers.

VTK6 changed the API slightly.  This solution was taken
directly from the VTK Wiki Examples.