edited implementation of _.flatten
edited implementation of _.flatten

imsingh/underscore,Aplopio/underscore,zabefloyd/underscore,veg/underscore,dfurtado/underscore,bailus/underscore,mitar/underscore,jonot/underscore,jfarid27/underscore,Gimcrack/underscore,vincent1988/underscore,Gimcrack/underscore,elancom/underscore,roychen-7/underscore,Forever8/underscore,janocat/underscore,vinodbonala/underscore,aziz-boudi4/underscore,vinodbonala/underscore,keepgoingwm/underscore,snackshen/underscore,Yangani/underscore,jridgewell/underscore,RepmujNetsik/underscore,LiskHQ/underscore,xiaoqiang730730/underscore,LiskHQ/underscore,ligson/underscore,emiel187/underscore,ereddate/underscore,AaronNGray/underscore-server,JoaquinSiabra/underscore,gougouGet/underscore,dkusch/underscore,PUSEN/underscore,debutt/underscore,greyhwndz/underscore,kuychaco/underscore,jpalomar/underscore,documentcloud/underscore,greyhwndz/underscore,lqjack/underscore,irr/underscore,craigmichaelmartin/underscore,mjhasbach/underscore,jdelbello/underscore,premkumargithub/underscore,kairyan/underscore,jianganglu/underscore,huzion/underscore,liminghui/underscore,jianganglu/underscore,WangRex/underscore,SerenoShen/underscore,dyx/underscore,lucasfanning/underscore,hackreactor/underscore,beenlee/underscore,elancom/underscore,braddunbar/underscore,irr/underscore,singhsterabhi/underscore,singhsterabhi/underscore,thiswildorchid/underscore,dxuehu/underscore,janocat/underscore,jpalomar/underscore,oss6/underscore,dfurtado/underscore,colemakdvorak/underscore,SerenoShen/underscore,yuhualingfeng/underscore,veg/underscore,kanso/underscore,falqas/underscore,strongconjunctions/underscore,SeriaWei/underscore,jordanwink201/underscore,Joanna913/underscore,1800joe/underscore,Tim-Zhang/underscore,wjb12/underscore,bkillenit/underscore,Feiyang1/underscore,paulfalgout/underscore,rlugojr/underscore,akre54/underscore,youprofit/underscore,yekg880809/underscore,Aplopio/underscore,cnwhy/underscore,keepgoingwm/underscore,ligson/underscore,amdjs/underscore,platinumazure/underscore,dxuehu/underscore,thisismygithub/underscore,ijidan/underscore,1800joe/underscore,nickkneafsey/underscore,gougouGet/underscore,xiaoqiang730730/underscore,Yangani/underscore,dyx/underscore,cgvarela/underscore,yuhualingfeng/underscore,debutt/underscore,ElseZhang/underscore,RepmujNetsik/underscore,mitar/underscore,zhangguangyong/underscore,polandeme/underscore,dimitriwalters/underscore,dkusch/underscore,wxmfront/underscore,eaglesjava/underscore,thiswildorchid/underscore,Joanna913/underscore,kwangkim/underscore,jridgewell/underscore,ryanwholey/underscore,huangnan1/2016gitStudy,jiankers/underscore,michaelficarra/underscore,rlugojr/underscore,liyandalmllml/underscore,kairyan/underscore,Tetpay/underscore,mjhasbach/underscore,zabefloyd/underscore,sdwang/underscore,mairasala/underscore,jordanwink201/underscore,tnga/underscore-es,kuychaco/underscore,hackreactor/underscore,prosenjit-itobuz/underscore,jdelbello/underscore,lqjack/underscore,cailong1028/underscore,michaelficarra/underscore,ThiagoGarciaAlves/underscore,ElseZhang/underscore,premkumargithub/underscore,thisismygithub/underscore,akre54/underscore,mdboop/underscore,colemakdvorak/underscore,strongconjunctions/underscore,imsingh/underscore,Tim-Zhang/underscore,wjb12/underscore,npmcomponent/component-underscore,Feiyang1/underscore,jolthoff/underscore,yekg880809/underscore,natac13/underscore,beenlee/underscore,ijidan/underscore,youprofit/underscore,oss6/underscore,sdwang/underscore,snackshen/underscore,npmcomponent/component-underscore,prosenjit-itobuz/underscore,aziz-boudi4/underscore,roychen-7/underscore,lis186/underscore,liminghui/underscore,craigmichaelmartin/underscore,jolthoff/underscore,jonot/underscore,falqas/underscore,ThiagoGarciaAlves/underscore,PUSEN/underscore,jashkenas/underscore,kwangkim/underscore,starterstep/underscore,amdjs/underscore,Forever8/underscore,bkillenit/underscore,cintiamh/underscore,mairasala/underscore,megawac/underscore,documentcloud/underscore,ryanwholey/underscore,appleboy/underscore,JoaquinSiabra/underscore,lucasfanning/underscore,cgvarela/underscore,huangnan1/2016gitStudy,jiankers/underscore,kanso/underscore,ereddate/underscore,vincent1988/underscore,emiel187/underscore,jashkenas/underscore,PengShi-sp/underscore,npmcomponent/jashkenas-underscore,JonAbrams/underscore,learning/underscore,zhangguangyong/underscore,lis186/underscore,huzion/underscore,PengShi-sp/underscore,WangRex/underscore,jfarid27/underscore,liyandalmllml/underscore,nickkneafsey/underscore,polandeme/underscore,platinumazure/underscore,wxmfront/underscore,tnga/underscore-es,eaglesjava/underscore,cintiamh/underscore,JonAbrams/underscore,cnwhy/underscore,SeriaWei/underscore,natac13/underscore,componentizr/underscore,bailus/underscore,starterstep/underscore,mdboop/underscore,AaronNGray/underscore-server