BUG: Segmentation fault in fibertractdispersion

Commiting Kent's fix to issue #9 I had raised in CompressedSensingDWI
Merge branch 'master' of https://github.com/pnlbwh/ukftractography
COMP: Implement updated Artichoke build to follow NAMICExternalProjects, Slicer, etc
Merge pull request #26 from Chaircrusher/Artichoke_Build

COMP: Implement updated Artichoke build to follow NAMICExternalProjects,...
ENH: Updates to default parameters in UKFTractography, as well as field names in output vtk files
COMP: workaround for not being able to find teem libraries