BUG: Images should be identified as images on cli, not as files.
ENH: Allow multiple seeds to be passed on cli
ENH: Pass intensity as a ridgeness parameter
ENH: PDFSegmenter now works with N-D images, and loads/saves class PDFs
BUG: Moved VTK-dependent apps to condition build based on USE_VTK
COMP: Convert sin/cos call to VNL equivalents
ENH: Uses optimizer to determine good SegmentTubes params
Merge pull request #255 from aylward/SegmentTubeParams

Segment tube params