Adds _.constant to the documentation page
Adds _.constant to the documentation page

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