Use bundle exec in CI guide. [ci skip]
Use bundle exec in CI guide. [ci skip]

h/t @ndarville
Ref: #2432

trungvothanh/jekyll,egobrightan/jekyll,PepSalehi/jekyll,doubleday/jekyll,tillgrallert/jekyll,ajhit406/jekyll,LuoPX-15510486969/jekyll,eloyesp/jekyll,trungvothanh/jekyll,rebornix/jekyll,pheuko/jekyll,nemotan/jekyll,monxim/monxim.github.io,schaazzz/jekyll,martynbm/jekyll,LeuisKen/jekyllcn,mnuessler/jekyll,royalwang/jekyll,matuzo/jekyll,jmptrader/jekyll,xtymichael/jekyll,xiaoshaozi52/jekyll,tylermachen/jekyll,QuinntyneBrown/jekyll,nasht00/jekyll,fulldecent/jekyll,rajrathore/jekyll,jmknoll/jekyll,jekyll/jekyll,angeliaz/jekyll,Strangehill/jekyll,teju111/jekyll,lazycai/lazycai.github.com,kuangyeheng/jekyll,chinayin/jekyll,rlugojr/jekyll,supriyantomaftuh/jekyll,daniel-beck/jekyll,1gitGrey/jekyll,garvitr/jekyll,Tiger66639/jekyll,ReachingOut/jekyll,isathish/jekyll,goragod/jekyll,drobati/jekyll,digideskio/jekyll,yihangho/jekyll,alex-kovac/jekyll,xiaoshaozi52/jekyll,christophermanning/jekyll,jeffkole/jekyll,eloyesp/jekyll,teju111/jekyll,Teino1978-Corp/jekyll,floydpraveen/jekyll,marrujoalex/jekyll,schaazzz/jekyll,hiteshsuthar/jekyll,Tyrion22/jekyll,hiteshsuthar/jekyll,nasht00/jekyll,howkj1/jekyll,hubsaysnuaa/jekyll,eninya/jekyll,alex-kovac/jekyll,xiongjungit/jekyll,rlugojr/jekyll,hartmel/jekyll,floydpraveen/jekyll,tomasdiez/jekyll,garvitr/jekyll,UniFreak/jekyllcn,supriyantomaftuh/jekyll,adilapapaya/jekyll,ewinkler/jekyll,jaroot32/jekyll,oresmus/jekyll,noikiy/jekyll,Kinghack/kinghack.github.com,doubleday/jekyll,jekyll/jekyll,ZainRizvi/jekyll,derekgottlieb/jekyll,gencer/jekyll,honger05/jekyllcn,wentixiaogege/jekyll,adilapapaya/jekyll,dansef/jekyll,Strangehill/jekyll,jekyll/jekyll,fengsmith/jekyllcn,derekgottlieb/jekyll,jmhardison/jekyll,ZDroid/jekyll,thetaxman/jekyll,alfredxing/jekyll,julienbourdeau/jekyll,alex-kovac/jekyll,thetaxman/jekyll,Strangehill/jekyll,lazycai/lazycai.github.com,xtymichael/jekyll,nathanhorrigan1/webdeveloper,MauroMrod/jekyll,AnanthaRajuC/jekyll,princeofdarkness76/jekyll,saitodisse/jekyll,ZDroid/jekyll,vcgato29/jekyll,AnanthaRajuC/jekyll,wadaries/jekyll,nemotan/jekyll,AaronSikes/jekyll,nateberkopec/jekyll,bsmr-ruby/jekyll,codeclimate-testing/jekyll,gaosboy/jekyll,Strangehill/jekyll,0x00evil/jekyll,desidude03/jekyll,mnuessler/jekyll,akoeplinger/jekyll,tillgrallert/jekyll,LeuisKen/jekyllcn,howkj1/jekyll,wadaries/jekyll,sideci-sample/sideci-sample-jekyll,FlyingWHR/jekyll,nasht00/jekyll,nathanhorrigan1/webdeveloper,jeffkole/jekyll,winndows/jekyll,ramoslin02/jekyll,saitodisse/jekyll,imaustink/jekyll,gkunwar/gkunwar.github.io,ramoslin02/jekyll,isathish/jekyll,ryanshaw/jekyll,jmknoll/jekyll,ajhit406/jekyll,doubleday/jekyll,nemotan/jekyll,pheuko/jekyll,cyberid41/jekyll,CorainChicago/jekyll,fengsmith/jekyll,18F/jekyll,jeffkole/jekyll,oresmus/jekyll,sasongkojati/jekyll,tillgrallert/jekyll,zhangkuaiji/jekyllcn,jmepg/jekyll,thetaxman/jekyll,1gitGrey/jekyll,xcatliu/jekyllcn,nickg33/jekyll,brint/jekyll,mrb/jekyll,rlugojr/jekyll,iRoxx/jekyll,tamouse/jekyll,zsyed91/jekyll,gencer/jekyll,ryanshaw/jekyll,vcgato29/jekyll,likong/jekyll,stomar/jekyll,shuber2/jekyll,nasht00/jekyll,superve/jekyll,xiaoshaozi52/jekyll,tareq-s/jekyll,tamouse/jekyll,CorainChicago/jekyll,tylermachen/jekyll,iRoxx/jekyll,dangaute/eng,gynter/jekyll,Tiger66639/jekyll,MauroMrod/jekyll,pmarsceill/jekyll,tamouse/jekyll,krahman/jekyll,yhironaka/yhironaka.github.io,tillgrallert/jekyll,Teino1978-Corp/jekyll,xiebinhqy/jklly_china,rebornix/jekyll,ajhit406/jekyll,yihangho/jekyll,chrisfinazzo/jekyll,ryanshaw/jekyll,jaybe-jekyll/jekyll,xiebinhqy/jklly_china,getandpost/jekyll.github.io,lazycai/lazycai.github.com,x-way/jekyll,christophermanning/jekyll,mixxmac/jekyll,jmepg/jekyll,marrujoalex/jekyll,floydpraveen/jekyll,supriyantomaftuh/jekyll,tomasdiez/jekyll,xantage/jekyll,tareq-s/jekyll,bsmr-ruby/jekyll,naughtyboy83/jekyll,krishnakalyan3/jekyll,LeuisKen/jekyllcn,stomar/jekyll,omeripek/jekyll,anthonyrosengren/grasshoppergathering2.github-io,ZDroid/jekyll,drobati/jekyll,derekgottlieb/jekyll,mrb/jekyll,alihalabyah/jekyll,tomjohnson1492/jekyll,AaronSikes/jekyll,xcatliu/jekyllcn,kuangyeheng/jekyll,jmknoll/jekyll,fulldecent/jekyll,chinayin/jekyll,howkj1/jekyll,pmarsceill/jekyll,gencer/jekyll,winndows/jekyll,xiebinhqy/jklly_china,digideskio/jekyll,xantage/jekyll,aarvay/jekyll,brint/jekyll,darwin/jekyll,QuinntyneBrown/jekyll,shliujing/jekyll,m2candre/jekyll,sideci-sample/sideci-sample-jekyll,ls2uper/jekyll,fulldecent/jekyll,htmelvis/jekyll,xantage/jekyll,rajrathore/jekyll,rasa2011/rasa2011.github.io,rasa2011/rasa2011.github.io,darwin/jekyll,greent2008/jekyll,foocoder/jekyll,chrisfinazzo/jekyll,alihalabyah/jekyll,chiyodad/jekyll,mnuessler/jekyll,nickg33/jekyll,iRoxx/jekyll,ajhit406/jekyll,rajrathore/jekyll,sasongkojati/jekyll,desidude03/jekyll,krahman/jekyll,brint/jekyll,princeofdarkness76/jekyll,tomjohnson1492/jekyll,indraj/jekyll,honger05/jekyllcn,chiyodad/jekyll,eloyesp/jekyll,hartmel/jekyll,getandpost/jekyll.github.io,stevecrozz/jekyll,saitodisse/jekyll,oresmus/jekyll,shuber2/jekyll,fabulousu/jekyll,cyberid41/jekyll,jaroot32/jekyll,julienbourdeau/jekyll,jaybe-jekyl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