feat(README): add node library
feat(README): add node library

Thanks for @stianeikeland for starting a node-etcd library.

cvik/etcd,tangkun75/etcd,hpcloud/etcd,kingland/etcd,chai2010-playground/etcd,sebrandon1/etcd,sofuture/etcd,mwitkow/etcd,bspline/etcd,onlyjob/etcd,crandles/etcd,betawaffle/etcd,jefby/etcd,gae123/etcd,sinsharat/etcd,hpcloud/etcd,asim/etcd,xebitstudios/etcd,westhood/etcd,swingbach/etcd,wowsoso/etcd,armstrongli/etcd,philips/etcd,etcd-io/etcd,betawaffle/etcd,HideoYamauchi/etcd,oscarrr110/etcd,CrazyJvm/etcd,tempbottle/etcd,yifan-gu/etcd,QuantiumTechnology/etcd,linuxcer/etcd,glensc/etcd,shafreeck/etcd,achanda/etcd,jchauncey/etcd,nkhare/etcd,xiang90/etcd,combk8s/etcd,purpleidea/etcd,jeremyeder/etcd,nekto0n/etcd,bakins/etcd,beni55/etcd,zaphod-concur/etcd,gyuho/etcd,bdarnell/etcd,cognusion/etcd,sayden/etcd,wfxiang08/etcd,dannysauer/etcd,yifan-gu/etcd,mwitkow/etcd,csuideal/etcd,plasticbox/etcd,pengzj/etcd,CrazyJvm/etcd,cvik/etcd,raoofm/etcd,pauldallen/etcd,pauldallen/etcd,chenbaihu/etcd,xychu/etcd,youxidev/etcd,dalanlan/etcd,mickep76/etcd,mike-lerch/etcd,delkyd/etcd,whuwxl/etcd,qiaochao911/etcd,joshix/etcd,ktateish/etcd,mitake/etcd,spotify/etcd,yudai/etcd,spacejam/etcd,StorReduce/etcd,ktateish/etcd,buaazp/etcd,hongchaodeng/etcd,hroyrh/etcd,shakefu/etcd,fanminshi/etcd,ravigadde/etcd,lzbgt/etcd,csuideal/etcd,kkaneda/etcd,visheshnp/etcd,xdlinear/etcd,cockroachdb/etcd,mwitkow-io/etcd,li-ang/etcd,junxu/etcd,devfreesg/etcd,kkaneda/etcd,gyuho/etcd,svdata/etcd,yyljlyy/etcd,wfxiang08/etcd,xueshanf/etcd,mkumatag/etcd,gae123/etcd,QuantiumTechnology/etcd,Ulexus/etcd,offscale/etcd,armstrongli/etcd,xychu/etcd,shakefu/etcd,Yhgenomics/etcd,fgbreel/etcd,zaphod-concur/etcd,hongbinz/etcd,insionng/etcd,qqsun8819/etcd,fasaxc/etcd,njucslqq/etcd,lzbgt/etcd,msanterre/etcd,dnaeon/etcd,cvik/etcd,crandles/etcd,gouyang/etcd,insionng/etcd,glycerine/etcd,etcd-io/etcd,rnaveiras/etcd,luxas/etcd,axingblog/etcd,ecnahc515/etcd,snailwalker/etcd,dannysauer/etcd,mike-lerch/etcd,tempbottle/etcd,handsomesun/etcd,axingblog/etcd,bluebreezecf/etcd,insequent/etcd,mitake/etcd,li-ang/etcd,barakmich/etcd,princeqjzh/etcd,sebschrader/etcd,StorReduce/etcd,tamird/etcd,hzy001/etcd,youxidev/etcd,beni55/etcd,SivagnanamCiena/etcd,joshix/etcd,elimisteve/etcd,HideoYamauchi/etcd,philips/etcd,barakmich/etcd,chenbaihu/etcd,a-robinson/etcd,kingland/etcd,TheHippo/etcd,fgbreel/etcd,rnaveiras/etcd,plasticbox/etcd,etcd-io/etcd,arthurcolle/etcd,qqsun8819/etcd,robszumski/etcd,mgoelzer/etcd-fork2,honeyqa/etcd,hroyrh/etcd,bspline/etcd,spacejam/etcd,tguangch/etcd,bluebreezecf/etcd,spotify/etcd,jchauncey/etcd,improbable-io/etcd,pengzj/etcd,wantonsolutions/dinv-etcd,xdlinear/etcd,coreos/etcd,achanda/etcd,mischief/etcd,ajityagaty/etcd,hzy001/etcd,yyljlyy/etcd,jmptrader/etcd,lorneli/etcd,tangkun75/etcd,shafreeck/etcd,freeloop1114/etcd,gosharplite/etcd,sebschrader/etcd,akauppi/etcd,siddontang/etcd,mqliang/etcd,combk8s/etcd,steveeJ/etcd,njharman/etcd,Ulexus/etcd,freeloop1114/etcd,westhood/etcd,yichengq/etcd,jonboulle/etcd,hongbinz/etcd,imzhulei/etcd,cloudfoundry/etcd,ecnahc515/etcd,endocode/etcd,pigfoot/etcd,insequent/etcd,Ulexus/etcd,ravigadde/etcd,mgoelzer/etcd-fork2,whuwxl/etcd,siddontang/etcd,njharman/etcd,bakins/etcd,cloudfoundry/etcd,qiaochao911/etcd,coreos/etcd,YuleiXiao/etcd,heyitsanthony/etcd,cvik/etcd,hongchaodeng/etcd,olark/etcd,giantswarm/etcd,chipironcin/etcd,cloudfoundry/etcd,dnaeon/etcd,oscarrr110/etcd,improbable-io/etcd,swingbach/etcd,chai2010-playground/etcd,ylong/etcd,sebrandon1/etcd,mkumatag/etcd,xiang90/etcd,justintung/etcd,lumjjb/etcd,spotify/etcd,jravetch/etcd,polvi/etcd,jlamillan/etcd,shawnps/etcd,glycerine/etcd,Eagle-X/etcd,lorneli/etcd,princeqjzh/etcd,jmptrader/etcd,gtank/etcd,devfreesg/etcd,purpleidea/etcd,svdata/etcd,dterei/etcd,cognusion/etcd,glevand/coreos--etcd,gityf/etcd,yichengq/etcd,cchamplin/etcd,fasaxc/etcd,cchamplin/etcd,jeremyeder/etcd,cockroachdb/etcd,justintung/etcd,gityf/etcd,yudai/etcd,wantonsolutions/dinv-etcd,xebitstudios/etcd,jlamillan/etcd,vimalk78/etcd,chai2010/etcd,iamqizhao/etcd,endocode/etcd,visheshnp/etcd,tamird/etcd,junxu/etcd,offscale/etcd,snailwalker/etcd,giantswarm/etcd,rchicoli/etcd,luxas/etcd,Timer/etcd,glensc/etcd,mqliang/etcd,nkhare/etcd,openedbox/etcd,robszumski/etcd,fanminshi/etcd,fasaxc/etcd,OyTao/etcd_learning,olark/etcd,YuleiXiao/etcd,buaazp/etcd,polvi/etcd,ajityagaty/etcd,bdarnell/etcd,raoofm/etcd,dterei/etcd,tguangch/etcd,jefby/etcd,philips/etcd,mwitkow-io/etcd,iamqizhao/etcd,SivagnanamCiena/etcd,glevand/coreos--etcd,a-robinson/etcd,gtank/etcd,openedbox/etcd,honeyqa/etcd,cloudfoundry/etcd,jonboulle/etcd,es-chow/etcd,sofuture/etcd,linuxcer/etcd,heyitsanthony/etcd,chai2010/etcd,imzhulei/etcd,es-chow/etcd,jravetch/etcd,asim/etcd,msanterre/etcd,nekto0n/etcd,dalanlan/etcd,mischief/etcd,TheHippo/etcd,Winslett/etcd,mkumatag/etcd,Winslett/etcd,wowsoso/etcd,rchicoli/etcd,spotify/etcd,Ulexus/etcd,elimisteve/etcd,vimalk78/etcd,onlyjob/etcd,gosharplite/etcd,ajityagaty/etcd,nieanan/etcd,Yhgenomics/etcd,OyTao/etcd_learning,rnaveiras/etcd,akauppi/etcd,sinsharat/etcd,wantonsolutions/dinv-etcd,mqliang/etcd,delkyd/etcd,shawnps/etcd,Eagle-X/etcd,ylong/etcd,Timer/etcd,mickep76/etcd,gouyang/etcd,handsomesun/etcd,nieanan/etcd,arthurcolle/etcd,njucslqq/etcd,lumjjb/etcd,chipironcin/etcd,steveeJ/etcd,sayden/etcd,xueshanf/etcd