ENH: Liver-specific methods.  Improvements to UA_SegmentVesselsTrainer
Merge pull request #6 from aylward/UA_SegmentVessels

ENH: Liver-specific methods.  Improvements to UA_SegmentVesselsTrainer
ENH: UA project format uses centralized parameter files.
Merge pull request #7 from aylward/UA_Segment

ENH: UA project format uses centralized parameter files.