Merge pull request #28 from ImageGuidedTherapyLab/master

usage
Added titles to figures. Fixed a bug in master_LOOCV where it was skipping the following thresholds
I added a sorting function that ensures the DSC and mu thresholds are arranged in ascending order, which is critical.
Merge branch 'master' of github.com:sjfahr/optpp_pds
Improving fig legend
Finished another LOOCV version. Some figure legend issues remain
Merge pull request #35 from sjfahr/master

LOOCV 2.1