Fix serialization problem with toSeq in workflow.
Fix serialization problem with toSeq in workflow.

ydanilenko/PredictionIO,sevenihust/PredictionIO,hsavit1/PredictionIO,elkingtonmcb/PredictionIO,b-cuts/PredictionIO,pferrel/PredictionIO,skmezanul/PredictionIO,beni55/PredictionIO,doron123/PredictionIO,marevol/incubator-predictionio,akaash-nigam/PredictionIO,clemp6r/PredictionIO,djeraseit/PredictionIO,PredictionIO/PredictionIO,BojianLi/PredictionIO,TheDataShed/PredictionIO,alex9311/PredictionIO,jasonchaffee/PredictionIO,adamharish/PredictionIO,initChan/PredictionIO,akaash-nigam/PredictionIO,atyenoria/PredictionIO,wenaz/PredictionIO,zafarella/PredictionIO,ydanilenko/PredictionIO,jlegendary/PredictionIO,atyenoria/PredictionIO,takeshineshiro/PredictionIO,indranig/PredictionIO,doron123/PredictionIO,himanshudhami/PredictionIO,hsavit1/PredictionIO,rbo7nik/PredictionIO,prmdsharma/PredictionIO,elkingtonmcb/PredictionIO,net-shell/PredictionIO,mars/incubator-predictionio,BojianLi/PredictionIO,Emaasit/PredictionIO,takeshineshiro/PredictionIO,druzbikova/PredictionIO,jasonchaffee/PredictionIO,rsganesh83/PredictionIO,codingang/PredictionIO,ydanilenko/PredictionIO,wenaz/PredictionIO,rsganesh83/PredictionIO,Ribeiro/PredictionIO,ionux/PredictionIO,adamharish/PredictionIO,rbo7nik/PredictionIO,jasonchaffee/PredictionIO,sekaiamber/PredictionIO,TheDataShed/PredictionIO,akaash-nigam/PredictionIO,sekaiamber/PredictionIO,tuxdna/PredictionIO,wangmiao1981/PredictionIO,jingyidata/PredictionIO,nvoron23/PredictionIO,stephen-corgiat/PredictionIO,cristiancrc/PredictionIO,EmergentOrder/PredictionIO,michaelshing/PredictionIO,tastatur/PredictionIO,michaelshing/PredictionIO,ydanilenko/PredictionIO,Ribeiro/PredictionIO,nvoron23/PredictionIO,Emaasit/PredictionIO,takezoe/incubator-predictionio,marevol/incubator-predictionio,net-shell/PredictionIO,BojianLi/PredictionIO,TheDataShed/PredictionIO,codingang/PredictionIO,wangmiao1981/PredictionIO,beni55/PredictionIO,indranig/PredictionIO,stephen-corgiat/PredictionIO,doron123/PredictionIO,tastatur/PredictionIO,Emaasit/PredictionIO,doron123/PredictionIO,Ribeiro/PredictionIO,jingyidata/PredictionIO,shimamoto/incubator-predictionio,ydanilenko/PredictionIO,EmergentOrder/PredictionIO,biddyweb/PredictionIO,wenaz/PredictionIO,arudenko/PredictionIO,dszeto/incubator-predictionio,jingyidata/PredictionIO,sevenihust/PredictionIO,TheDataShed/PredictionIO,akaash-nigam/PredictionIO,cristiancrc/PredictionIO,takezoe/incubator-predictionio,takezoe/incubator-predictionio,nvoron23/PredictionIO,mars/incubator-predictionio,codingang/PredictionIO,atyenoria/PredictionIO,dszeto/incubator-predictionio,tastatur/PredictionIO,thiagoveras/PredictionIO,arudenko/PredictionIO,thiagoveras/PredictionIO,alex9311/PredictionIO,beni55/PredictionIO,djeraseit/PredictionIO,clemp6r/PredictionIO,ionux/PredictionIO,initChan/PredictionIO,ch33hau/PredictionIO,tuxdna/PredictionIO,TheDataShed/PredictionIO,indranig/PredictionIO,BuildAPE/PredictionIO,ch33hau/PredictionIO,skmezanul/PredictionIO,atyenoria/PredictionIO,indranig/PredictionIO,ch33hau/PredictionIO,EmergentOrder/PredictionIO,schon/PredictionIO,thiagoveras/PredictionIO,zafarella/PredictionIO,skmezanul/PredictionIO,nvoron23/PredictionIO,nvoron23/PredictionIO,BuildAPE/PredictionIO,schon/PredictionIO,schon/PredictionIO,BojianLi/PredictionIO,marevol/incubator-predictionio,adamharish/PredictionIO,sevenihust/PredictionIO,shimamoto/incubator-predictionio,prmdsharma/PredictionIO,jlegendary/PredictionIO,initChan/PredictionIO,sekaiamber/PredictionIO,wangmiao1981/PredictionIO,codingang/PredictionIO,net-shell/PredictionIO,doron123/PredictionIO,arudenko/PredictionIO,takezoe/incubator-predictionio,prmdsharma/PredictionIO,Ribeiro/PredictionIO,druzbikova/PredictionIO,mars/incubator-predictionio,biddyweb/PredictionIO,prmdsharma/PredictionIO,clemp6r/PredictionIO,marevol/incubator-predictionio,atyenoria/PredictionIO,djeraseit/PredictionIO,b-cuts/PredictionIO,shimamoto/incubator-predictionio,cristiancrc/PredictionIO,BuildAPE/PredictionIO,jlegendary/PredictionIO,tuxdna/PredictionIO,hsavit1/PredictionIO,dszeto/incubator-predictionio,jlegendary/PredictionIO,rbo7nik/PredictionIO,ionux/PredictionIO,b-cuts/PredictionIO,akaash-nigam/PredictionIO,shimamoto/incubator-predictionio,indranig/PredictionIO,PredictionIO/PredictionIO,himanshudhami/PredictionIO,biddyweb/PredictionIO,himanshudhami/PredictionIO,takeshineshiro/PredictionIO,PredictionIO/PredictionIO,stephen-corgiat/PredictionIO,jlegendary/PredictionIO,pferrel/PredictionIO,pferrel/PredictionIO,druzbikova/PredictionIO,rsganesh83/PredictionIO,mars/incubator-predictionio,BojianLi/PredictionIO,prmdsharma/PredictionIO,net-shell/PredictionIO,zafarella/PredictionIO,michaelshing/PredictionIO,net-shell/PredictionIO,Ribeiro/PredictionIO,codingang/PredictionIO,alex9311/PredictionIO,himanshudhami/PredictionIO,dszeto/incubator-predictionio,elkingtonmcb/PredictionIO