update contributor's guide
update contributor's guide

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