Support RDiscount 2.
Support RDiscount 2.

Fixes #2747.

shuber2/jekyll,martynbm/jekyll,cyberid41/jekyll,christophermanning/jekyll,rasa2011/rasa2011.github.io,dansef/jekyll,ramoslin02/jekyll,larryfox/jekyll,ajhit406/jekyll,zsyed91/jekyll,princeofdarkness76/jekyll,eloyesp/jekyll,liukaijv/jekyll,fulldecent/jekyll,ryanshaw/jekyll,alex-kovac/jekyll,gynter/jekyll,tamouse/jekyll,daniel-beck/jekyll,ewinkler/jekyll,princeofdarkness76/jekyll,iRoxx/jekyll,tylermachen/jekyll,bsmr-ruby/jekyll,eloyesp/jekyll,getandpost/jekyll.github.io,abhilashhb/jekyll,honger05/jekyllcn,marrujoalex/jekyll,tomjohnson1492/jekyll,ewinkler/jekyll,gencer/jekyll,derekgottlieb/jekyll,oresmus/jekyll,jeffkole/jekyll,harrissoerja/jekyll,nateberkopec/jekyll,superve/jekyll,MjAbuz/jekyll,wadaries/jekyll,SQS2/Test,Wirachmat/jekyll,garvitr/jekyll,richsoni/jekyll,cyberid41/jekyll,daniel-beck/jekyll,derekgottlieb/jekyll,AaronSikes/jekyll,saitodisse/jekyll,nickg33/jekyll,tamouse/jekyll,supriyantomaftuh/jekyll,naughtyboy83/jekyll,adilapapaya/jekyll,hiteshsuthar/jekyll,princeofdarkness76/jekyll,hartmel/jekyll,chrisfinazzo/jekyll,Wirachmat/jekyll,goragod/jekyll,noikiy/jekyll,aarvay/jekyll,xiebinhqy/jklly_china,rongl/jekyll,nemotan/jekyll,jmhardison/jekyll,alex-kovac/jekyll,fengsmith/jekyll,PepSalehi/jekyll,desidude03/jekyll,x-way/jekyll,floydpraveen/jekyll,chinayin/jekyll,vidbina/jekyll,johnnycastilho/jekyll,larryfox/jekyll,sasongkojati/jekyll,christophermanning/jekyll,hiteshsuthar/jekyll,xantage/jekyll,krishnakalyan3/jekyll,tomjohnson1492/jekyll,stomar/jekyll,rebornix/jekyll,alex-kovac/jekyll,gencer/jekyll,angeliaz/jekyll,xiongjungit/jekyll,EddieDow/jekyll,ReachingOut/jekyll,pheuko/jekyll,wadaries/jekyll,ramoslin02/jekyll,krishnakalyan3/jekyll,rlugojr/jekyll,QuinntyneBrown/jekyll,greent2008/jekyll,tillgrallert/jekyll,PepSalehi/jekyll,backendeveloper/jekyll,xtymichael/jekyll,krahman/jekyll,stevecrozz/jekyll,abhilashhb/jekyll,pmarsceill/jekyll,jmknoll/jekyll,doubleday/jekyll,MjAbuz/jekyll,gkunwar/gkunwar.github.io,garvitr/jekyll,tomasdiez/jekyll,ryanshaw/jekyll,floydpraveen/jekyll,Tyrion22/jekyll,teju111/jekyll,wentixiaogege/jekyll,jekyll/jekyll,Tyrion22/jekyll,nasht00/jekyll,tylermachen/jekyll,tomasdiez/jekyll,kuangyeheng/jekyll,martynbm/jekyll,mrb/jekyll,ducktyper/jekyll,jmptrader/jekyll,matuzo/jekyll,kimeng/jekyll,honger05/jekyllcn,chiyodad/jekyll,rlugojr/jekyll,tillgrallert/jekyll,tareq-s/jekyll,penchan1218/jekyllcn,jekyll/jekyll,mixxmac/jekyll,AtekiRyu/jekyll,indraj/jekyll,tillgrallert/jekyll,egobrightan/jekyll,m2candre/jekyll,SQS2/Test,thetaxman/jekyll,penchan1218/jekyllcn,harrissoerja/jekyll,jmhardison/jekyll,xantage/jekyll,sanxore/sanxore.github.com,getandpost/jekyll.github.io,supriyantomaftuh/jekyll,christophermanning/jekyll,ls2uper/jekyll,garvitr/jekyll,thetaxman/jekyll,rasa2011/rasa2011.github.io,julienbourdeau/jekyll,mnuessler/jekyll,ducktyper/jekyll,indraj/jekyll,howkj1/jekyll,mixxmac/jekyll,LeuisKen/jekyllcn,Strangehill/jekyll,gencer/jekyll,alfredxing/jekyll,marrujoalex/jekyll,pmarsceill/jekyll,zhangkuaiji/jekyllcn,omeripek/jekyll,saitodisse/jekyll,jmepg/jekyll,rebornix/jekyll,Teino1978-Corp/jekyll,krahman/jekyll,gencer/jekyll,SQS2/Test,harrissoerja/jekyll,kimeng/jekyll,UniFreak/jekyllcn,gaosboy/jekyll,angeliaz/jekyll,kimeng/jekyll,jaroot32/jekyll,CPVPLachlan/CPVP-Blog,darwin/jekyll,kuangyeheng/jekyll,fulldecent/jekyll,rebornix/jekyll,kuangyeheng/jekyll,sideci-sample/sideci-sample-jekyll,alihalabyah/jekyll,zhangkuaiji/jekyllcn,howkj1/jekyll,ReachingOut/jekyll,MauroMrod/jekyll,tugberkugurlu/jekyll,fulldecent/jekyll,drobati/jekyll,foocoder/jekyll,oresmus/jekyll,Teino1978-Corp/Teino1978-Corp-jekyll,fabulousu/jekyll,oresmus/jekyll,naughtyboy83/jekyll,AnanthaRajuC/jekyll,xiongjungit/jekyll,tareq-s/jekyll,eninya/jekyll,tillgrallert/jekyll,AnanthaRajuC/jekyll,xiaoshaozi52/jekyll,codeclimate-testing/jekyll,hiteshsuthar/jekyll,rovrevik/jekyll,xcatliu/jekyllcn,alfredxing/jekyll,nickg33/jekyll,ZainRizvi/jekyll,xcatliu/jekyllcn,hartmel/jekyll,ajhit406/jekyll,shliujing/jekyll,jaybe-jekyll/jekyll,likong/jekyll,dangaute/eng,goragod/jekyll,noikiy/jekyll,noikiy/jekyll,rajrathore/jekyll,shliujing/jekyll,Tyrion22/jekyll,tugberkugurlu/jekyll,fengsmith/jekyll,royalwang/jekyll,digideskio/jekyll,18F/jekyll,teju111/jekyll,rajrathore/jekyll,superve/jekyll,marrujoalex/jekyll,FlyingWHR/jekyll,CorainChicago/jekyll,vidbina/jekyll,pheuko/jekyll,greent2008/jekyll,rasa2011/rasa2011.github.io,nasht00/jekyll,aarvay/jekyll,Tiger66639/jekyll,doubleday/jekyll,trungvothanh/jekyll,ewinkler/jekyll,imaustink/jekyll,vcgato29/jekyll,0x00evil/jekyll,cyberid41/jekyll,xiaoshaozi52/jekyll,krahman/jekyll,floydpraveen/jekyll,ZDroid/jekyll,CheekyFE/jekyll,Teino1978-Corp/jekyll,rovrevik/jekyll,codeclimate-testing/jekyll,zsyed91/jekyll,x-way/jekyll,jekyll/jekyll,jeffkole/jekyll,sanxore/sanxore.github.com,xiaoshaozi52/jekyll,gynter/jekyll,getandpost/jekyll.github.io,ryanshaw/jekyll,Strangehill/jekyll,honger05/jekyllcn,Strangehill/jekyll,egobrightan/jekyll,vidbina/jekyll,fabulousu/jekyll,jaybe-jekyll/jekyll,howkj1/jekyll,AaronSikes/jekyll,winndows/jeky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