feat(etcd): add version flag
feat(etcd): add version flag

print the version and exit, very simple :)

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