Support URLs in "github" config
Support URLs in "github" config

Fixes GitbookIO/gitbook.io#90

palerdot/gitbook,tzq668766/gitbook,youprofit/gitbook,escopecz/documentation,jocr1627/gitbook,hongbinz/gitbook,jasonslyvia/gitbook,Abhikos/gitbook,2390183798/gitbook,intfrr/gitbook,mautic/documentation,bjlxj2008/gitbook,athiruban/gitbook,xiongjungit/gitbook,youprofit/gitbook,grokcoder/gitbook,wewelove/gitbook,yaonphy/SwiftBlog,ryanswanson/gitbook,escopecz/documentation,xxxhycl2010/gitbook,haamop/documentation,xcv58/gitbook,xcv58/gitbook,OriPekelman/gitbook,bradparks/gitbook,sudobashme/gitbook,a-moses/gitbook,boyXiong/gitbook,mruse/gitbook,grokcoder/gitbook,qingying5810/gitbook,rohan07/gitbook,sunlianghua/gitbook,FKV587/gitbook,webwlsong/gitbook,FKV587/gitbook,jasonslyvia/gitbook,lucciano/gitbook,iflyup/gitbook,sunlianghua/gitbook,jocr1627/gitbook,kamyu104/gitbook,iamchenxin/gitbook,switchspan/gitbook,boyXiong/gitbook,vehar/gitbook,ferrior30/gitbook,bradparks/gitbook,thelastmile/gitbook,ZachLamb/gitbook,bjlxj2008/gitbook,switchspan/gitbook,snowsnail/gitbook,rohan07/gitbook,mautic/documentation,nycitt/gitbook,codepiano/gitbook,anrim/gitbook,gencer/gitbook,webwlsong/gitbook,megumiteam/documentation,megumiteam/documentation,gencer/gitbook,alex-dixon/gitbook,guiquanz/gitbook,strawluffy/gitbook,hongbinz/gitbook,hujianfei1989/gitbook,guiquanz/gitbook,iamchenxin/gitbook,ferrior30/gitbook,GitbookIO/gitbook,xxxhycl2010/gitbook,wewelove/gitbook,tzq668766/gitbook,vehar/gitbook,justinleoye/gitbook,JohnTroony/gitbook,thelastmile/gitbook,tshoper/gitbook,gdbooks/gitbook,minghe/gitbook,JozoVilcek/gitbook,justinleoye/gitbook,npracht/documentation,xiongjungit/gitbook,snowsnail/gitbook,gaearon/gitbook,minghe/gitbook,shibe97/gitbook,Keystion/gitbook,OriPekelman/gitbook,hujianfei1989/gitbook,alex-dixon/gitbook,nycitt/gitbook,intfrr/gitbook,gaearon/gitbook,npracht/documentation,tshoper/gitbook,CN-Sean/gitbook,mruse/gitbook,lucciano/gitbook,iflyup/gitbook,2390183798/gitbook,codepiano/gitbook,haamop/documentation,athiruban/gitbook,kamyu104/gitbook,ZachLamb/gitbook,CN-Sean/gitbook,qingying5810/gitbook,a-moses/gitbook,sudobashme/gitbook,gdbooks/gitbook,JohnTroony/gitbook,palerdot/gitbook,shibe97/gitbook