Smart volume.display. Closes #174.
Merge pull request #175 from tsherif/volume-display

Smart volume.display. Closes #174.
added option to choose volumes
code cleanup
Merge pull request #176 from AldoMarzullo/chooseVolume

added option to choose volumes
Cleaned up Surface Viewer color mapping.
Merge pull request #177 from tsherif/color-mapping

Cleaned up Surface Viewer color mapping.
minc2volume-viewer script now exports 2 functions when require()'d