default id_class_dict to None for gene classifiers

track metadata in predictions

add option for relabeling data from prior label class dict, update dict paths in manifest

ensure gene class dict only inverted when using gene classifier

fix gene class dict labeling

precommit formatting

update with 12L and 20L i4096 gc95M models, multitask and quantiz code

save pval

Update for gene classification (#330)

add option for hyperparameter tuning to cc.validate

Add classifier module and examples