Update doc/install/installation.md
Update doc/install/installation.md

changed installation overview list step #4
Gitolite -> GitLab shell 
NuLL3rr0r/gitlabhq,dwrensha/gitlabhq,vjustov/gitlabhq,MauriceMohlek/gitlabhq,htve/GitlabForChinese,xuvw/gitlabhq,yulchitaj/TEST3,ayufan/gitlabhq,salipro4ever/gitlabhq,jairzh/gitlabhq-sfdc,pjknkda/gitlabhq,NKMR6194/gitlabhq,WSDC-NITWarangal/gitlabhq,sue445/gitlabhq,theodi/gitlabhq,Exeia/gitlabhq,atomaka/gitlabhq,tk23/gitlabhq,lvfeng1130/gitlabhq,k4zzk/gitlabhq,t-zuehlsdorff/gitlabhq,manfer/gitlabhq,NARKOZ/gitlabhq,zBMNForks/gitlabhq,jrjang/gitlab-ce,martinma4/gitlabhq,akumetsuv/gitlab,louahola/gitlabhq,8thcolor/testing-public-gitlabhq,ibiart/gitlabhq,ikappas/gitlabhq,cncodog/gitlab,LUMC/gitlabhq,openwide-java/gitlabhq,jaepyoung/gitlabhq,nguyen-tien-mulodo/gitlabhq,yama07/gitlabhq,MauriceMohlek/gitlabhq,jvanbaarsen/gitlabhq,mr-dxdy/gitlabhq,ikappas/gitlabhq,koreamic/gitlabhq,SkyWei/gitlabhq,8thcolor/rubyconfau2015-sadr,123Haynes/gitlabhq,xuvw/gitlabhq,mmkassem/gitlabhq,ayufan/gitlabhq,larryli/gitlabhq,atomaka/gitlabhq,daiyu/gitlab-zh,gopeter/gitlabhq,screenpages/gitlabhq,eliasp/gitlabhq,Telekom-PD/gitlabhq,Kambda/Mobbr,tempbottle/gitlabhq,CodeCantor/gitlabhq,zBMNForks/gitlabhq,OtkurBiz/gitlabhq,fscherwi/gitlabhq,zrbsprite/gitlabhq,duduribeiro/gitlabhq,Telekom-PD/gitlabhq,jrjang/gitlabhq,theodi/gitlabhq,williamherry/gitlabhq,iiet/iiet-git,rebecamendez/gitlabhq,ksoichiro/gitlabhq,ZeoAlliance/gitlabhq,sonalkr132/gitlabhq,8thcolor/rubyconfau2015-sadr,koreamic/gitlabhq,rhels/gitlabhq,yonglehou/gitlabhq,Datacom/gitlabhq,ngpestelos/gitlabhq,mavimo/gitlabhq,123Haynes/gitlabhq,icedwater/gitlabhq,pkgr/gitlabhq,fantasywind/gitlabhq,TheWatcher/gitlabhq,wangcan2014/gitlabhq,luzhongyang/gitlabhq,LUMC/gitlabhq,Tyrael/gitlabhq,kotaro-dev/gitlab-6-9,stanhu/gitlabhq,vjustov/gitlabhq,zrbsprite/gitlabhq,betabot7/gitlabhq,betabot7/gitlabhq,sonalkr132/gitlabhq,kemenaran/gitlabhq,fantasywind/gitlabhq,Keystion/gitlabhq,tempbottle/gitlabhq,TheWatcher/gitlabhq,louahola/gitlabhq,darkrasid/gitlabhq,hacsoc/gitlabhq,yama07/gitlabhq,julianengel/gitlabhq,goeun/myRepo,0x20h/gitlabhq,per-garden/gitlabhq,goeun/myRepo,openwide-java/gitlabhq,chadyred/gitlabhq,darkrasid/gitlabhq,duduribeiro/gitlabhq,yonglehou/gitlabhq,whluwit/gitlabhq,phinfonet/mobbr-gitlabhq,delkyd/gitlabhq,nmav/gitlabhq,michaKFromParis/sparkslab,duduribeiro/gitlabhq,Kambda/mobbr-gitlabhq,8thcolor/eurucamp2014-htdsadr,LytayTOUCH/gitlabhq,kitech/gitlabhq,per-garden/gitlabhq,Soullivaneuh/gitlabhq,ferdinandrosario/gitlabhq,martinma4/gitlabhq,ArthurHoaro/Public-GitLab,sakishum/gitlabhq,neiljbrookes/glab,dreampet/gitlab,pupaxxo/gitlabhq,icedwater/gitlabhq,bladealslayer/gitlabhq,NKMR6194/gitlabhq,fgbreel/gitlabhq,sakishum/gitlabhq,betabot7/gitlabhq,Exeia/gitlabhq,martinma4/gitlabhq,fearenales/gitlabhq,windymid/test2,liyakun/gitlabhq,childbamboo/gitlabhq,lbt/gitlabhq,sonalkr132/gitlabhq,hq804116393/gitlabhq,gopeter/gitlabhq,daiyu/gitlab-zh,ikappas/gitlabhq,WSDC-NITWarangal/gitlabhq,nuecho/gitlabhq,zrbsprite/gitlabhq,akumetsuv/gitlab,johnmyqin/gitlabhq,ArthurHoaro/Public-GitLab,pkgr/gitlabhq,Tyrael/gitlabhq,sakishum/gitlabhq,stoplightio/gitlabhq,chenrui2014/gitlabhq,pulkit21/gitlabhq,LUMC/gitlabhq,mente/gitlabhq,OlegGirko/gitlab-ce,hacsoc/gitlabhq,mathstuf/gitlabhq,folpindo/gitlabhq,dplarson/gitlabhq,yatish27/gitlabhq,joalmeid/gitlabhq,1ed/gitlabhq,screenpages/gitlabhq,8thcolor/eurucamp2014-htdsadr,NuLL3rr0r/gitlabhq,stellamiranda/mobbr-gitlabhq,htve/GitlabForChinese,tim-hoff/gitlabhq,openwide-java/gitlabhq,hacsoc/gitlabhq,axilleas/gitlabhq,szechyjs/gitlabhq,daiyu/gitlab-zh,Kambda/Mobbr,martinma4/gitlabhq,8thcolor/eurucamp2014-htdsadr,Exeia/gitlabhq,Burick/gitlabhq,stellamiranda/mobbr-gitlabhq,mavimo/gitlabhq,ordiychen/gitlabhq,stanhu/gitlabhq,adaiguoguo/gitlab_globalserarch,yatish27/gitlabhq,nguyen-tien-mulodo/gitlabhq,dplarson/gitlabhq,achako/gitlabhq,pjknkda/gitlabhq,fgbreel/gitlabhq,allysonbarros/gitlabhq,larryli/gitlabhq,cui-liqiang/gitlab-ce,NuLL3rr0r/gitlabhq,cncodog/gitlab,copystudy/gitlabhq,sonalkr132/gitlabhq,SVArago/gitlabhq,mmkassem/gitlabhq,tempbottle/gitlabhq,gorgee/gitlabhq,shinexiao/gitlabhq,jirutka/gitlabhq,rumpelsepp/gitlabhq,johnmyqin/gitlabhq,ttasanen/gitlabhq,williamherry/gitlabhq,screenpages/gitlabhq,pulkit21/gitlabhq,htve/GitlabForChinese,mathstuf/gitlabhq,Tyrael/gitlabhq,akumetsuv/gitlab,per-garden/gitlabhq,gorgee/gitlabhq,chenrui2014/gitlabhq,julianengel/gitlabhq,pupaxxo/gitlabhq,TheWatcher/gitlabhq,jairzh/gitlabhq-sfdc,dreampet/gitlab,mrb/gitlabhq,eliasp/gitlabhq,kitech/gitlabhq,ayufan/gitlabhq,hq804116393/gitlabhq,Devin001/gitlabhq,yfaizal/gitlabhq,gopeter/gitlabhq,MauriceMohlek/gitlabhq,since2014/gitlabhq,ibiart/gitlabhq,yulchitaj/TEST3,Datacom/gitlabhq,tk23/gitlabhq,OtkurBiz/gitlabhq,bozaro/gitlabhq,fpgentil/gitlabhq,jairzh/gitlabhq-sfdc,pkgr/gitlabhq,jaepyoung/gitlabhq,WSDC-NITWarangal/gitlabhq,fendoudeqingchunhh/gitlabhq,phinfonet/mobbr-gitlabhq,CodeCantor/gitlabhq,kemenaran/gitlabhq,mrb/gitlabhq,dplarson/gitlabhq,123Haynes/gitlabhq,michaKFromParis/gitlabhq,luzhongyang/gitlabhq,fearenales/gitlabhq,initiummedia/gitlabhq,revaret/gitlabhq,liyakun/gitlabhq,dvrylc/gitlabhq,mmkassem/gitlabhq,luzhongyang/gitlabhq,darkrasid/gitlabhq,copystudy/gitlabhq,rumpelsepp/gitlabhq,Soullivaneuh/gitlabhq,ordiychen/gitlabhq,jrjang/gitlabhq,yatish27/gitlabhq,nguyen-tien-mulodo/gitlabhq,Datacom/gitlabhq,pkallberg/tjenare,achako/gitlabhq,it33/gitlabhq,mathstuf/gitlabhq,lbt/gitlabhq,Tyrael/gitlabhq,0x20h/gitlabhq,stellamiranda/mobbr-gitlabhq,t-zuehlsdorff/gitlabhq,revaret/gitlabhq,OtkurBiz/gitlabhq,iiet/iiet-git,jrjang/gitlab-ce,mmkassem/gitlabhq,H3Chief/gitlabhq,cinderblock/gitlabhq,wangcan2014/gitlabhq,dvrylc/gitlabhq,Kambda/Mobbr,H3Chief/gitlabhq,fpgentil/gitlabhq,initiummedia/gitlabhq,initiummedia/gitlabhq,allysonbarros/gitlabhq,stoplightio/gitlabhq,mr-dxdy/gitlabhq,fantasywind/gitlabhq,sekcheong/gitlabhq,ordiychen/gitlabhq,Keystion/gitlabhq,whluwit/gitlabhq,goeun/myRepo,NARKOZ/gitlabhq,martijnvermaat/gitlabhq,folpindo/gitlabhq,michaKFromParis/gitlabhqold,rhels/gitlabhq,bbodenmiller/gitlabhq,stanhu/gitlabhq,bigsurge/gitlabhq,rfeese/gitlab-ce,NARKOZ/gitlabhq,yfaizal/gitlabhq,jvanbaarsen/gitlabhq,sideci-sample/sideci-sample-gitlabhq,kitech/gitlabhq,ikappas/gitlabhq,8thcolor/testing-public-gitlabhq,dukex/gitlabhq,sideci-sample/sideci-sample-gitlabhq,Datacom/gitlabhq,Razer6/gitlabhq,mr-dxdy/gitlabhq,lvfeng1130/gitlabhq,theodi/gitlabhq,eliasp/gitlabhq,jirutka/gitlabhq,ngpestelos/gitlabhq,michaKFromParis/sparkslab,childbamboo/gitlabhq,0x20h/gitlabhq,aaronsnyder/gitlabhq,iiet/iiet-git,jaepyoung/gitlabhq,jairzh/gitlabhq-sfdc,nmav/gitlabhq,ordiychen/gitlabhq,larryli/gitlabhq,ttasanen/gitlabhq,Burick/gitlabhq,kemenaran/gitlabhq,phinfonet/mobbr-gitlabhq,mente/gitlabhq,williamherry/gitlabhq,NKMR6194/gitlabhq,rebecamendez/gitlabhq,sideci-sample/sideci-sample-gitlabhq,icedwater/gitlabhq,allysonbarros/gitlabhq,manfer/gitlabhq,axilleas/gitlabhq,Soullivaneuh/gitlabhq,LytayTOUCH/gitlabhq,pupaxxo/gitlabhq,dreampet/gitlab,cui-liqiang/gitlab-ce,daiyu/gitlab-zh,williamherry/gitlabhq,bozaro/gitlabhq,CodeCantor/gitlabhq,bozaro/gitlabhq,louahola/gitlabhq,cinderblock/gitlabhq,allistera/gitlabhq,since2014/gitlabhq,shinexiao/gitlabhq,shinexiao/gitlabhq,tempbottle/gitlabhq,flashbuckets/gitlabhq,hzy001/gitlabhq,SkyWei/gitlabhq,jrjang/gitlab-ce,fearenales/gitlabhq,vjustov/gitlabhq,martijnvermaat/gitlabhq,michaKFromParis/gitlabhqold,Kambda/mobbr-gitlabhq,stoplightio/gitlabhq,it33/gitlabhq,flashbuckets/gitlabhq,theonlydoo/gitlabhq,copystudy/gitlabhq,ferdinandrosario/gitlabhq,dwrensha/gitlabhq,k4zzk/gitlabhq,fantasywind/gitlabhq,salipro4ever/gitlabhq,jaepyoung/gitlabhq,michaKFromParis/sparkslab,since2014/gitlabhq,yuyue2013/ss,pulkit21/gitlabhq,pulkit21/gitlabhq,manfer/gitlabhq,bigsurge/gitlabhq,cui-liqiang/gitlab-ce,ngpestelos/gitlabhq,jvanbaarsen/gitlabhq,fearenales/gitlabhq,ksoichiro/gitlabhq,szechyjs/gitlabhq,Razer6/gitlabhq,allistera/gitlabhq,rumpelsepp/gitlabhq,ibiart/gitlabhq,rfeese/gitlab-ce,kotaro-dev/gitlab-6-9,tim-hoff/gitlabhq,revaret/gitlabhq,joalmeid/gitlabhq,sue445/gitlabhq,sue445/gitlabhq,dvrylc/gitlabhq,mathstuf/gitlabhq,michaKFromParis/gitlabhq,yama07/gitlabhq,jrjang/gitlabhq,dwrensha/gitlabhq,it33/gitlabhq,Devin001/gitlabhq,dvrylc/gitlabhq,DanielZhangQingLong/gitlabhq,cinderblock/gitlabhq,liyakun/gitlabhq,bozaro/gitlabhq,cncodog/gitlab,bladealslayer/gitlabhq,yama07/gitlabhq,allistera/gitlabhq,cui-liqiang/gitlab-ce,gopeter/gitlabhq,koreamic/gitlabhq,neiljbrookes/glab,stoplightio/gitlabhq,neiljbrookes/glab,bbodenmiller/gitlabhq,OlegGirko/gitlab-ce,SVArago/gitlabhq,johnmyqin/gitlabhq,ZeoAlliance/gitlabhq,adaiguoguo/gitlab_globalserarch,aaronsnyder/gitlabhq,achako/gitlabhq,WSDC-NITWarangal/gitlabhq,1ed/gitlabhq,tim-hoff/gitlabhq,SVArago/gitlabhq,wangcan2014/gitlabhq,bbodenmiller/gitlabhq,delkyd/gitlabhq,OlegGirko/gitlab-ce,NKMR6194/gitlabhq,jvanbaarsen/gitlabhq,SkyWei/gitlabhq,LytayTOUCH/gitlabhq,H3Chief/gitlabhq,chadyred/gitlabhq,koreamic/gitlabhq,Kambda/mobbr-gitlabhq,nmav/gitlabhq,hzy001/gitlabhq,kotaro-dev/gitlab-6-9,flashbuckets/gitlabhq,fgbreel/gitlabhq,aaronsnyder/gitlabhq,MauriceMohlek/gitlabhq,louahola/gitlabhq,copystudy/gitlabhq,DanielZhangQingLong/gitlabhq,mrb/gitlabhq,hzy001/gitlabhq,delkyd/gitlabhq,whluwit/gitlabhq,adaiguoguo/gitlab_globalserarch,childbamboo/gitlabhq,nmav/gitlabhq,htve/GitlabForChinese,8thcolor/testing-public-gitlabhq,Telekom-PD/gitlabhq,salipro4ever/gitlabhq,kitech/gitlabhq,salipro4ever/gitlabhq,fendoudeqingchunhh/gitlabhq,screenpages/gitlabhq,darkrasid/gitlabhq,joalmeid/gitlabhq,eliasp/gitlabhq,zBMNForks/gitlabhq,bbodenmiller/gitlabhq,liyakun/gitlabhq,Keystion/gitlabhq,yonglehou/gitlabhq,it33/gitlabhq,fscherwi/gitlabhq,ZeoAlliance/gitlabhq,openwide-java/gitlabhq,youprofit/gitlabhq,Razer6/gitlabhq,szechyjs/gitlabhq,atomaka/gitlabhq,yfaizal/gitlabhq,fgbreel/gitlabhq,dukex/gitlabhq,revaret/gitlabhq,fscherwi/gitlabhq,theonlydoo/gitlabhq,icedwater/gitlabhq,chenrui2014/gitlabhq,ferdinandrosario/gitlabhq,theodi/gitlabhq,kemenaran/gitlabhq,sakishum/gitlabhq,childbamboo/gitlabhq,lvfeng1130/gitlabhq,hq804116393/gitlabhq,pjknkda/gitlabhq,mavimo/gitlabhq,bladealslayer/gitlabhq,Burick/gitlabhq,fpgentil/gitlabhq,fendoudeqingchunhh/gitlabhq,dukex/gitlabhq,lvfeng1130/gitlabhq,zrbsprite/gitlabhq,luzhongyang/gitlabhq,LUMC/gitlabhq,aaronsnyder/gitlabhq,yulchitaj/TEST3,TheWatcher/gitlabhq,michaKFromParis/gitlabhqold,mavimo/gitlabhq,dukex/gitlabhq,ttasanen/gitlabhq,pkallberg/tjenare,yatish27/gitlabhq,rfeese/gitlab-ce,mr-dxdy/gitlabhq,rumpelsepp/gitlabhq,rhels/gitlabhq,Burick/gitlabhq,axilleas/gitlabhq,Keystion/gitlabhq,nuecho/gitlabhq,fpgentil/gitlabhq,jrjang/gitlabhq,michaKFromParis/gitlabhq,k4zzk/gitlabhq,H3Chief/gitlabhq,yuyue2013/ss,adaiguoguo/gitlab_globalserarch,Razer6/gitlabhq,sekcheong/gitlabhq,nuecho/gitlabhq,Devin001/gitlabhq,rfeese/gitlab-ce,michaKFromParis/sparkslab,delkyd/gitlabhq,folpindo/gitlabhq,youprofit/gitlabhq,SkyWei/gitlabhq,zBMNForks/gitlabhq,rhels/gitlabhq,windymid/test2,dwrensha/gitlabhq,gorgee/gitlabhq,xuvw/gitlabhq,vjustov/gitlabhq,cinderblock/gitlabhq,DanielZhangQingLong/gitlabhq,initiummedia/gitlabhq,tk23/gitlabhq,michaKFromParis/gitlabhq,martijnvermaat/gitlabhq,joalmeid/gitlabhq,yfaizal/gitlabhq,larryli/gitlabhq,hzy001/gitlabhq,julianengel/gitlabhq,folpindo/gitlabhq,theonlydoo/gitlabhq,mrb/gitlabhq,Exeia/gitlabhq,ngpestelos/gitlabhq,ferdinandrosario/gitlabhq,julianengel/gitlabhq,t-zuehlsdorff/gitlabhq,theonlydoo/gitlabhq,t-zuehlsdorff/gitlabhq,whluwit/gitlabhq,duduribeiro/gitlabhq,ArthurHoaro/Public-GitLab,OtkurBiz/gitlabhq,hq804116393/gitlabhq,NARKOZ/gitlabhq,chadyred/gitlabhq,pjknkda/gitlabhq,tim-hoff/gitlabhq,sekcheong/gitlabhq,bigsurge/gitlabhq,dreampet/gitlab,fscherwi/gitlabhq,youprofit/gitlabhq,stanhu/gitlabhq,per-garden/gitlabhq,ksoichiro/gitlabhq,axilleas/gitlabhq,LytayTOUCH/gitlabhq,OlegGirko/gitlab-ce,k4zzk/gitlabhq,tk23/gitlabhq,windymid/test2,chadyred/gitlabhq,ksoichiro/gitlabhq,gorgee/gitlabhq,Soullivaneuh/gitlabhq,since2014/gitlabhq,bigsurge/gitlabhq,lbt/gitlabhq,jirutka/gitlabhq,Devin001/gitlabhq,michaKFromParis/gitlabhqold,flashbuckets/gitlabhq,szechyjs/gitlabhq,1ed/gitlabhq,DanielZhangQingLong/gitlabhq,pkallberg/tjenare,manfer/gitlabhq,nguyen-tien-mulodo/gitlabhq,dplarson/gitlabhq,wangcan2014/gitlabhq,jirutka/gitlabhq,jrjang/gitlab-ce,SVArago/gitlabhq,shinexiao/gitlabhq,ttasanen/gitlabhq,ayufan/gitlabhq,cncodog/gitlab,rebecamendez/gitlabhq,fendoudeqingchunhh/gitlabhq,hacsoc/gitlabhq,martijnvermaat/gitlabhq,sekcheong/gitlabhq,yulchitaj/TEST3,yonglehou/gitlabhq,mente/gitlabhq,allistera/gitlabhq,iiet/iiet-git,sue445/gitlabhq,yuyue2013/ss,yuyue2013/ss,rebecamendez/gitlabhq,Telekom-PD/gitlabhq,mente/gitlabhq,youprofit/gitlabhq,allysonbarros/gitlabhq,johnmyqin/gitlabhq,chenrui2014/gitlabhq,8thcolor/rubyconfau2015-sadr