ModelMetrics 1.2.0

added kappa statistic
added s3 methods for glm, lm, randomForest, merMod, and glmerMod
sped up auc with data.table::frankv
added gini

ModelMetrics 1.1.0

added Matthews correlation coefficient (mcc)
added multiclass auc (mauc )
lots more tests
fixed bug when rank ties were present in auc (#10)
added code to handle different classes in functions

ModelMetrics 1.0.0

Initializing package with basic metric functions