adding 'addClassMapping' method to model_utils
adding 'addClassMapping' method to model_utils

SNASW/rendr,rendrjs/rendr,eGood/rendr0.5,CristinaFoltea/rendr,kball/rendr,is00hcw/rendr,bigethan/rendr,sarchila/rendr,modulexcite/rendr,alexindigo/rendr,0111001101111010/rendr,yhagio/rendr