Integrated Arno's shared AUC computation and display into GLM2.
Merge branch 'master' of github.com:0xdata/h2o

Conflicts:
	src/main/java/water/api/AUC.java
Removed some redundant code (replaced by shared auc computation) and set the best threshold of vlm model to be the best default threshold of AUC object (right now max F1).
Changed default best threshold to be default AUC threshold instead of explicit max F1.
Merge branch 'master' of github.com:0xdata/h2o
Added back accidentally removed aid compute call in the end of vlm validation.