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