Move volume example to more specific name
Improve resting example colormap and commentary
Make doc Makefile more robust to OSX Mayavi issues
Move Surface to utils

Surface was not imported in utils, which was breaking coord_to_label.
I could not perform a relative import of io from utils (I do not understand
that bug, but there were some other reports of similar issues with package
modules named io on Google).

Anyway, tests pass and docs build with the reorganization.
Improving aesthetics of the focus label example
Add focus label to the gitignore
Tweak probabilistic labels example
Import project_volume_data at the top level
Add basic volume example and clarify basic surface example
Adding underlying files for logo
Adapting MNE Python gen_rst sphinxext for thumbnails
Change name of label example for ordering
Change name of contour example for ordering
Fix gen_rst so example index isn't double-headered
Delete montage example for now
Move view example for ordering
Rename view example
Improve code and aesthetics of parc values example
Updating basic volume example further
Name full and thumb images differently in gen_rst