Add --init param to update_submodules grunt task
Add --init param to update_submodules grunt task

Closes #3141

Brunation11/Ghost,prosenjit-itobuz/Ghost,shrimpy/Ghost,thinq4yourself/Unmistakable-Blog,augbog/Ghost,camilodelvasto/localghost,manishchhabra/Ghost,JulienBrks/Ghost,kmeurer/Ghost,camilodelvasto/herokughost,skmezanul/Ghost,lf2941270/Ghost,etdev/blog,daimaqiao/Ghost-Bridge,dai-shi/Ghost,kevinansfield/Ghost,katrotz/blog.katrotz.space,Netazoic/bad-gateway,icowan/Ghost,jiachenning/Ghost,woodyrew/Ghost,hoxoa/Ghost,tidyui/Ghost,benstoltz/Ghost,aschmoe/jesse-ghost-app,GroupxDev/javaPress,achimos/ghost_as,sajmoon/Ghost,ananthhh/Ghost,Klaudit/Ghost,petersucks/blog,cncodog/Ghost-zh-codog,ryanbrunner/crafters,davidenq/Ghost-Blog,tadityar/Ghost,singular78/Ghost,ITJesse/Ghost-zh,ghostchina/website,novaugust/Ghost,dylanchernick/ghostblog,TribeMedia/Ghost,jeonghwan-kim/Ghost,dymx101/Ghost,virtuallyearthed/Ghost,veyo-care/Ghost,syaiful6/Ghost,leninhasda/Ghost,Smile42RU/Ghost,dqj/Ghost,mohanambati/Ghost,cncodog/Ghost-zh-codog,ghostchina/Ghost-zh,patrickdbakke/ghost-spa,alexandrachifor/Ghost,wangjun/Ghost,InnoD-WebTier/hardboiled_ghost,PaulBGD/Ghost-Plus,ITJesse/Ghost-zh,exsodus3249/Ghost,atandon/Ghost,daihuaye/Ghost,ryansukale/ux.ryansukale.com,rollokb/Ghost,dbalders/Ghost,nmukh/Ghost,pathayes/FoodBlog,yangli1990/Ghost,sergeylukin/Ghost,MadeOnMars/Ghost,UnbounDev/Ghost,tanbo800/Ghost,llv22/Ghost,lethalbrains/Ghost,freele/ghost,diancloud/Ghost,blankmaker/Ghost,JohnONolan/Ghost,veyo-care/Ghost,AlexKVal/Ghost,telco2011/Ghost,BlueHatbRit/Ghost,jamesslock/Ghost,johnnymitch/Ghost,theonlypat/Ghost,bastianbin/Ghost,yundt/seisenpenji,ghostchina/Ghost.zh,hyokosdeveloper/Ghost,olsio/Ghost,kwangkim/Ghost,Aaron1992/Ghost,letsjustfixit/Ghost,fredeerock/atlabghost,vainglori0us/urban-fortnight,wallmarkets/Ghost,optikalefx/Ghost,no1lov3sme/Ghost,zhiyishou/Ghost,Smile42RU/Ghost,uploadcare/uploadcare-ghost-demo,jorgegilmoreira/ghost,axross/ghost,melissaroman/ghost-blog,jaguerra/Ghost,patterncoder/patterncoder,zhiyishou/Ghost,duyetdev/islab,hnarayanan/narayanan.co,rafaelstz/Ghost,uploadcare/uploadcare-ghost-demo,yanntech/Ghost,devleague/uber-hackathon,situkangsayur/Ghost,Jai-Chaudhary/Ghost,YY030913/Ghost,andrewconnell/Ghost,dYale/blog,r14r/fork_nodejs_ghost,davidenq/Ghost-Blog,pathayes/FoodBlog,sebgie/Ghost,omaracrystal/Ghost,acburdine/Ghost,RufusMbugua/TheoryOfACoder,mnitchie/Ghost,denzelwamburu/denzel.xyz,netputer/Ghost,ClarkGH/Ghost,developer-prosenjit/Ghost,FredericBernardo/Ghost,JohnONolan/Ghost,liftup/ghost,metadevfoundation/Ghost,wspandihai/Ghost,katrotz/blog.katrotz.space,dggr/Ghost-sr,chevex/undoctrinate,lukaszklis/Ghost,k2byew/Ghost,adam-paterson/blog,Kaenn/Ghost,Alxandr/Blog,ManRueda/Ghost,lowkeyfred/Ghost,zackslash/Ghost,arvidsvensson/Ghost,tmp-reg/Ghost,mohanambati/Ghost,rizkyario/Ghost,davidmenger/nodejsfan,velimir0xff/Ghost,ASwitlyk/Ghost,NamedGod/Ghost,UsmanJ/Ghost,bsansouci/Ghost,mhhf/ghost-latex,makapen/Ghost,kevinansfield/Ghost,KnowLoading/Ghost,francisco-filho/Ghost,johngeorgewright/blog.j-g-w.info,nneko/Ghost,tandrewnichols/ghost,ignasbernotas/nullifer,dgem/Ghost,gabfssilva/Ghost,xiongjungit/Ghost,zumobi/Ghost,sunh3/Ghost,ivanoats/ivanstorck.com,claudiordgz/Ghost,psychobunny/Ghost,edurangel/Ghost,schneidmaster/theventriloquist.us,lukw00/Ghost,trunk-studio/Ghost,tksander/Ghost,Loyalsoldier/Ghost,KnowLoading/Ghost,acburdine/Ghost,pedroha/Ghost,dymx101/Ghost,ananthhh/Ghost,VillainyStudios/Ghost,daimaqiao/Ghost-Bridge,skleung/blog,smaty1/Ghost,panezhang/Ghost,Coding-House/Ghost,neynah/GhostSS,kevinansfield/Ghost,klinker-apps/ghost,thomasalrin/Ghost,handcode7/Ghost,carlosmtx/Ghost,leonli/ghost,duyetdev/islab,djensen47/Ghost,GroupxDev/javaPress,Loyalsoldier/Ghost,ashishapy/ghostpy,Japh/Ghost,UsmanJ/Ghost,ManRueda/Ghost,vloom/blog,sifatsultan/js-ghost,gcamana/Ghost,lanffy/Ghost,cysys/ghost-openshift,stridespace/Ghost,dqj/Ghost,akveo/akveo-blog,r14r/fork_nodejs_ghost,Shauky/Ghost,load11/ghost,Feitianyuan/Ghost,schematical/Ghost,laispace/laiblog,telco2011/Ghost,neynah/GhostSS,madole/diverse-learners,jacostag/Ghost,mttschltz/ghostblog,novaugust/Ghost,pensierinmusica/Ghost,beautyOfProgram/Ghost,jomahoney/Ghost,shrimpy/Ghost,Remchi/Ghost,Netazoic/bad-gateway,PDXIII/Ghost-FormMailer,ddeveloperr/Ghost,optikalefx/Ghost,ckousik/Ghost,v3rt1go/Ghost,Netazoic/bad-gateway,smedrano/Ghost,mttschltz/ghostblog,Netazoic/bad-gateway,ballPointPenguin/Ghost,javimolla/Ghost,allanjsx/Ghost,eduardojmatos/eduardomatos.me,gcamana/Ghost,Bunk/Ghost,wemakeweb/Ghost,Brunation11/Ghost,allspiritseve/mindlikewater,tadityar/Ghost,cwonrails/Ghost,krahman/Ghost,icowan/Ghost,ryansukale/ux.ryansukale.com,aroneiermann/GhostJade,leonli/ghost,velimir0xff/Ghost,influitive/crafters,melissaroman/ghost-blog,Azzurrio/Ghost,camilodelvasto/herokughost,cysys/ghost-openshift,ashishapy/ghostpy,hilerchyn/Ghost,yundt/seisenpenji,bisoe/Ghost,diogogmt/Ghost,mlabieniec/ghost-env,bastianbin/Ghost,omaracrystal/Ghost,chris-yoon90/Ghost,jomofrodo/ccb-ghost,MadeOnMars/Ghost,ThorstenHans/Ghost,PDXIII/Ghost-FormMailer,hyokosdeveloper/Ghost,JulienBrks/Ghost,greyhwndz/Ghost,r1N0Xmk2/Ghost,Dnlyc/Ghost,PeterCxy/Ghost,Sebastian1011/Ghost,makapen/Ghost,rouanw/Ghost,lf2941270/Ghost,cicorias/Ghost,cobbspur/Ghost,letsjustfixit/Ghost,skleung/blog,NovaDevelopGroup/Academy,k2byew/Ghost,manishchhabra/Ghost,stridespace/Ghost,mdbw/ghost,darvelo/Ghost,rmoorman/Ghost,julianromera/Ghost,sangcu/Ghost,rchrd2/Ghost,darvelo/Ghost,smedrano/Ghost,tanbo800/Ghost,camilodelvasto/localghost,mattchupp/blog,lethalbrains/Ghost,JonSmith/Ghost,Elektro1776/javaPress,chris-yoon90/Ghost,etanxing/Ghost,Jai-Chaudhary/Ghost,jaguerra/Ghost,Gargol/Ghost,daihuaye/Ghost,dai-shi/Ghost,dgem/Ghost,tuan/Ghost,wallmarkets/Ghost,ThorstenHans/Ghost,ManRueda/manrueda-blog,bbmepic/Ghost,laispace/laiblog,telco2011/Ghost,allspiritseve/mindlikewater,zumobi/Ghost,uniqname/everydaydelicious,janvt/Ghost,jparyani/GhostSS,mikecastro26/ghost-custom,AileenCGN/Ghost,praveenscience/Ghost,e10/Ghost,Klaudit/Ghost,allanjsx/Ghost,leninhasda/Ghost,qdk0901/Ghost,thehogfather/Ghost,no1lov3sme/Ghost,delgermurun/Ghost,YY030913/Ghost,mlabieniec/ghost-env,SkynetInc/steam,gabfssilva/Ghost,yanntech/Ghost,mayconxhh/Ghost,gleneivey/Ghost,codeincarnate/Ghost,flomotlik/Ghost,Trendy/Ghost,edsadr/Ghost,bosung90/Ghost,mdbw/ghost,pollbox/ghostblog,ballPointPenguin/Ghost,epicmiller/pages,ljhsai/Ghost,rizkyario/Ghost,zeropaper/Ghost,anijap/PhotoGhost,sunh3/Ghost,vainglori0us/urban-fortnight,Kikobeats/Ghost,mattchupp/blog,NodeJSBarenko/Ghost,denzelwamburu/denzel.xyz,fredeerock/atlabghost,ddeveloperr/Ghost,obsoleted/Ghost,aschmoe/jesse-ghost-app,greyhwndz/Ghost,bisoe/Ghost,DesenTao/Ghost,FredericBernardo/Ghost,flpms/ghost-ad,benstoltz/Ghost,jeonghwan-kim/Ghost,ivantedja/ghost,syaiful6/Ghost,Xibao-Lv/Ghost,SachaG/bjjbot-blog,johnnymitch/Ghost,alecho/Ghost,obsoleted/Ghost,tyrikio/Ghost,katiefenn/Ghost,nakamuraapp/new-ghost,PaulBGD/Ghost-Plus,lukaszklis/Ghost,theonlypat/Ghost,barbastan/Ghost,kortemy/Ghost,ivanoats/ivanstorck.com,ladislas/ghost,rizkyario/Ghost,bigertech/Ghost,greenboxindonesia/Ghost,ManRueda/Ghost,Romdeau/Ghost,jgillich/Ghost,Kikobeats/Ghost,kaiqigong/Ghost,Kaenn/Ghost,arvidsvensson/Ghost,kolorahl/Ghost,skmezanul/Ghost,SachaG/bjjbot-blog,sankumsek/Ghost-ashram,AlexKVal/Ghost,jomahoney/Ghost,tandrewnichols/ghost,ygbhf/Ghost,hnarayanan/narayanan.co,hnq90/Ghost,RoopaS/demo-intern,notno/Ghost,trepafi/ghost-base,AnthonyCorrado/Ghost,javorszky/Ghost,beautyOfProgram/Ghost,kortemy/Ghost,Japh/shortcoffee,Gargol/Ghost,ryanbrunner/crafters,ManRueda/manrueda-blog,praveenscience/Ghost,jin/Ghost,MrMaksimize/sdg1,BayPhillips/Ghost,NikolaiIvanov/Ghost,GarrethDottin/Habits-Design,jiachenning/Ghost,dylanchernick/ghostblog,STANAPO/Ghost,Coding-House/Ghost,vishnuharidas/Ghost,TryGhost/Ghost,Dnlyc/Ghost,Azzurrio/Ghost,dggr/Ghost-sr,shannonshsu/Ghost,memezilla/Ghost,stridespace/Ghost,exsodus3249/Ghost,diancloud/Ghost,TryGhost/Ghost,sangcu/Ghost,letsjustfixit/Ghost,atandon/Ghost,floofydoug/Ghost,Feitianyuan/Ghost,klinker-apps/ghost,zackslash/Ghost,jiangjian-zh/Ghost,jamesslock/Ghost,Polyrhythm/dolce,karmakaze/Ghost,lukw00/Ghost,ladislas/ghost,jin/Ghost,STANAPO/Ghost,cicorias/Ghost,adam-paterson/blog,sfpgmr/Ghost,tmp-reg/Ghost,edurangel/Ghost,rafaelstz/Ghost,daimaqiao/Ghost-Bridge,riyadhalnur/Ghost,flomotlik/Ghost,davidmenger/nodejsfan,jorgegilmoreira/ghost,handcode7/Ghost,kwangkim/Ghost,hnq90/Ghost,javorszky/Ghost,JonSmith/Ghost,mtvillwock/Ghost,lowkeyfred/Ghost,leonli/ghost,jgillich/Ghost,sceltoas/Ghost,floofydoug/Ghost,InnoD-WebTier/hardboiled_ghost,prosenjit-itobuz/Ghost,Romdeau/Ghost,johngeorgewright/blog.j-g-w.info,Rovak/Ghost,jgladch/taskworksource,lcamacho/Ghost,memezilla/Ghost,hoxoa/Ghost,bitjson/Ghost,mlabieniec/ghost-env,pensierinmusica/Ghost,mnitchie/Ghost,Kikobeats/Ghost,tidyui/Ghost,imjerrybao/Ghost,devleague/uber-hackathon,panezhang/Ghost,dbalders/Ghost,phillipalexander/Ghost,shannonshsu/Ghost,bosung90/Ghost,etanxing/Ghost,NovaDevelopGroup/Academy,rameshponnada/Ghost,francisco-filho/Ghost,wspandihai/Ghost,kmeurer/Ghost,jomofrodo/ccb-ghost,augbog/Ghost,patterncoder/patterncoder,TryGhost/Ghost,ygbhf/Ghost,psychobunny/Ghost,PepijnSenders/whatsontheotherside,Remchi/Ghost,LeandroNascimento/Ghost,lukekhamilton/Ghost,Rovak/Ghost,jparyani/GhostSS,disordinary/Ghost,IbrahimAmin/Ghost,LeandroNascimento/Ghost,ericbenson/GhostAzureSetup,ASwitlyk/Ghost,e10/Ghost,GarrethDottin/Habits-Design,dbalders/Ghost,ineitzke/Ghost,RufusMbugua/TheoryOfACoder,cwonrails/Ghost,tksander/Ghost,rouanw/Ghost,carlyledavis/Ghost,virtuallyearthed/Ghost,kolorahl/Ghost,jomofrodo/ccb-ghost,PeterCxy/Ghost,pollbox/ghostblog,vloom/blog,Alxandr/Blog,diogogmt/Ghost,riyadhalnur/Ghost,zeropaper/Ghost,sfpgmr/Ghost,smaty1/Ghost,novaugust/Ghost,blankmaker/Ghost,thinq4yourself/Unmistakable-Blog,notno/Ghost,ljhsai/Ghost,ignasbernotas/nullifer,karmakaze/Ghost,vainglori0us/urban-fortnight,TribeMedia/Ghost,cysys/ghost-openshift,scopevale/wethepeopleweb.org,nmukh/Ghost,jorgegilmoreira/ghost,JonathanZWhite/Ghost,neynah/GhostSS,NikolaiIvanov/Ghost,weareleka/blog,BayPhillips/Ghost,UnbounDev/Ghost,aexmachina/blog-old,jparyani/GhostSS,Elektro1776/javaPress,ClarkGH/Ghost,rameshponnada/Ghost,dggr/Ghost-sr,JonathanZWhite/Ghost,mayconxhh/Ghost,olsio/Ghost,Japh/shortcoffee,load11/ghost,NamedGod/Ghost,claudiordgz/Ghost,lukekhamilton/Ghost,julianromera/Ghost,aroneiermann/GhostJade,codeincarnate/Ghost,carlyledavis/Ghost,sebgie/Ghost,Trendy/Ghost,v3rt1go/Ghost,anijap/PhotoGhost,BlueHatbRit/Ghost,GroupxDev/javaPress,yangli1990/Ghost,weareleka/blog,JohnONolan/Ghost,axross/ghost,epicmiller/pages,flpms/ghost-ad,janvt/Ghost,kortemy/Ghost,wemakeweb/Ghost,sajmoon/Ghost,cwonrails/Ghost,DesenTao/Ghost,devleague/uber-hackathon,ineitzke/Ghost,influitive/crafters,liftup/ghost,thehogfather/Ghost,madole/diverse-learners,Yarov/yarov,woodyrew/Ghost,barbastan/Ghost,morficus/Ghost,Japh/Ghost,ghostchina/Ghost-zh,jaswilli/Ghost,Alxandr/Blog,sifatsultan/js-ghost,jacostag/Ghost,imjerrybao/Ghost,davidenq/Ghost-Blog,AnthonyCorrado/Ghost,ericbenson/GhostAzureSetup,bbmepic/Ghost,schneidmaster/theventriloquist.us,morficus/Ghost,sceltoas/Ghost,cncodog/Ghost-zh-codog,kaychaks/kaushikc.org,singular78/Ghost,bsansouci/Ghost,allanjsx/Ghost,lanffy/Ghost,cqricky/Ghost,pbevin/Ghost,alecho/Ghost,Kaenn/Ghost,NovaDevelopGroup/Academy,ErisDS/Ghost,llv22/Ghost,IbrahimAmin/Ghost,Sebastian1011/Ghost,tyrikio/Ghost,trunk-studio/Ghost,pedroha/Ghost,rito/Ghost,ngosinafrica/SiteForNGOs,Elektro1776/javaPress,kaychaks/kaushikc.org,rmoorman/Ghost,delgermurun/Ghost,netputer/Ghost,ngosinafrica/SiteForNGOs,dYale/blog,javimolla/Ghost,mtvillwock/Ghost,carlosmtx/Ghost,etdev/blog,mhhf/ghost-latex,nneko/Ghost,Bunk/Ghost,Yarov/yarov,rito/Ghost,laispace/laiblog,xiongjungit/Ghost,ErisDS/Ghost,disordinary/Ghost,djensen47/Ghost,rchrd2/Ghost,metadevfoundation/Ghost,singular78/Ghost,tchapi/igneet-blog,jaswilli/Ghost,PepijnSenders/whatsontheotherside,petersucks/blog,pbevin/Ghost,phillipalexander/Ghost,kaiqigong/Ghost,thomasalrin/Ghost,cqricky/Ghost,ckousik/Ghost,mohanambati/Ghost,ManRueda/manrueda-blog,qdk0901/Ghost,edsadr/Ghost,wangjun/Ghost,VillainyStudios/Ghost,jiangjian-zh/Ghost,ErisDS/Ghost,achimos/ghost_as,kmeurer/GhostAzureSetup,akveo/akveo-blog,rollokb/Ghost,SkynetInc/steam,schematical/Ghost,situkangsayur/Ghost,bitjson/Ghost,InnoD-WebTier/hardboiled_ghost,sebgie/Ghost,developer-prosenjit/Ghost,sergeylukin/Ghost,Xibao-Lv/Ghost,greenboxindonesia/Ghost,andrewconnell/Ghost,gleneivey/Ghost,hilerchyn/Ghost,r1N0Xmk2/Ghost,ghostchina/Ghost.zh,acburdine/Ghost