OS-2339 Create AUCCrossValLoss to calculate the area under the curve of ROC
OS-2339 fix AUC algorithm to use thresholds for AUC points
OS-2339 modify crossValLoss to use more efficient calculation of area, new unit tests
OS-2339 update calculations to handle case where more than 1 data point has the same probability
OS-2339 cleanup unit test
OS-2339 test against larger data set
Merge pull request #13 from sanity/OS-2339

OS-2339 Create AUCCrossValLoss to calculate the area under the curve of ROC