Remove unneeded extend implementation.
Remove unneeded extend implementation.

refs #2179, #2156
- Replace extend with _.extend

Japh/shortcoffee,greyhwndz/Ghost,mattchupp/blog,bastianbin/Ghost,jgladch/taskworksource,zackslash/Ghost,alecho/Ghost,jomahoney/Ghost,ITJesse/Ghost-zh,virtuallyearthed/Ghost,jaswilli/Ghost,hyokosdeveloper/Ghost,scopevale/wethepeopleweb.org,choskim/ghost_exp,r1N0Xmk2/Ghost,ljhsai/Ghost,wspandihai/Ghost,syaiful6/Ghost,schematical/Ghost,disordinary/Ghost,melissaroman/ghost-blog,delgermurun/Ghost,ITJesse/Ghost-zh,pollbox/ghostblog,kaychaks/kaushikc.org,kortemy/Ghost,BayPhillips/Ghost,NovaDevelopGroup/Academy,kwangkim/Ghost,sebgie/Ghost,greenboxindonesia/Ghost,jiangjian-zh/Ghost,chris-yoon90/Ghost,Loyalsoldier/Ghost,gcamana/Ghost,NamedGod/Ghost,darvelo/Ghost,jeonghwan-kim/Ghost,Coding-House/Ghost,FredericBernardo/Ghost,rameshponnada/Ghost,cicorias/Ghost,gabfssilva/Ghost,patrickdbakke/ghost-spa,DesenTao/Ghost,jparyani/GhostSS,JohnONolan/Ghost,exsodus3249/Ghost,PaulBGD/Ghost-Plus,Kikobeats/Ghost,pbevin/Ghost,jiachenning/Ghost,arvidsvensson/Ghost,duyetdev/islab,rchrd2/Ghost,dai-shi/Ghost,yundt/seisenpenji,oimou-house/blog,thehogfather/Ghost,ManRueda/manrueda-blog,edurangel/Ghost,jeonghwan-kim/Ghost,zackslash/Ghost,tanbo800/Ghost,lanffy/Ghost,ghostchina/Ghost.zh,davegw/dgw-website,karmakaze/Ghost,beautyOfProgram/Ghost,telco2011/Ghost,Azzurrio/Ghost,davegw/dgw-website,cysys/ghost-openshift,jaguerra/Ghost,Gargol/Ghost,AlexKVal/Ghost,kaiqigong/Ghost,sajmoon/Ghost,obsoleted/Ghost,telco2011/Ghost,velimir0xff/Ghost,theonlypat/Ghost,mlabieniec/ghost-env,riyadhalnur/Ghost,ManRueda/Ghost,morficus/Ghost,jiachenning/Ghost,mnitchie/Ghost,janvt/Ghost,phillipalexander/Ghost,pathayes/FoodBlog,rollokb/Ghost,sfpgmr/Ghost,ddeveloperr/Ghost,carlyledavis/Ghost,YY030913/Ghost,PDXIII/Ghost-FormMailer,LeandroNascimento/Ghost,shannonshsu/Ghost,ericbenson/GhostAzureSetup,e10/Ghost,dbalders/Ghost,laispace/laiblog,kortemy/Ghost,Gargol/Ghost,darvelo/Ghost,lowkeyfred/Ghost,TryGhost/Ghost,acburdine/Ghost,petersucks/blog,mattvh/Ghost,axross/ghost,InnoD-WebTier/hardboiled_ghost,olsio/Ghost,smaty1/Ghost,lukekhamilton/Ghost,mattvh/Ghost,k2byew/Ghost,rwjblue/Ghost,jamesyothers/Ghost,weareleka/blog,v3rt1go/Ghost,claudiordgz/Ghost,hoxoa/Ghost,davidblurton/salmondesign-old,laispace/laiblog,Sebastian1011/Ghost,ballPointPenguin/Ghost,bastianbin/Ghost,andrewconnell/Ghost,yanntech/Ghost,GroupxDev/javaPress,GarrethDottin/Habits-Design,mdbw/ghost,notno/Ghost,ghostchina/Ghost-zh,aroneiermann/GhostJade,karmakaze/Ghost,diogogmt/Ghost,InnoD-WebTier/hardboiled_ghost,handcode7/Ghost,schneidmaster/theventriloquist.us,camilodelvasto/herokughost,xiongjungit/Ghost,thinq4yourself/Unmistakable-Blog,codeincarnate/Ghost,devleague/uber-hackathon,ASwitlyk/Ghost,barbastan/Ghost,mhhf/ghost-latex,zeropaper/Ghost,e10/Ghost,psychobunny/Ghost,NikolaiIvanov/Ghost,r1N0Xmk2/Ghost,STANAPO/Ghost,telco2011/Ghost,daimaqiao/Ghost-Bridge,hilerchyn/Ghost,AlexKVal/Ghost,Smile42RU/Ghost,uploadcare/uploadcare-ghost-demo,bbmepic/Ghost,jamesslock/Ghost,sankumsek/Ghost-ashram,mayconxhh/Ghost,neynah/GhostSS,flpms/ghost-ad,nneko/Ghost,tandrewnichols/ghost,no1lov3sme/Ghost,schneidmaster/theventriloquist.us,weareleka/blog,cncodog/Ghost-zh-codog,pathayes/FoodBlog,llv22/Ghost,ThorstenHans/Ghost,optikalefx/Ghost,InnoD-WebTier/hardboiled_ghost,etanxing/Ghost,zhiyishou/Ghost,ivanoats/ivanstorck.com,notno/Ghost,javimolla/Ghost,vainglori0us/urban-fortnight,akveo/akveo-blog,nmukh/Ghost,PepijnSenders/whatsontheotherside,SachaG/bjjbot-blog,francisco-filho/Ghost,tidyui/Ghost,zeropaper/Ghost,allanjsx/Ghost,consoleblog/consoleblog,thinq4yourself/Unmistakable-Blog,r14r/fork_nodejs_ghost,camilodelvasto/localghost,DesenTao/Ghost,PaulBGD/Ghost-Plus,velimir0xff/Ghost,dbalders/Ghost,KnowLoading/Ghost,sceltoas/Ghost,kevinansfield/Ghost,trepafi/ghost-base,sergeylukin/Ghost,GarrethDottin/Habits-Design,wallmarkets/Ghost,yanntech/Ghost,tksander/Ghost,cncodog/Ghost-zh-codog,ljhsai/Ghost,adam-paterson/blog,edsadr/Ghost,skmezanul/Ghost,NodeJSBarenko/Ghost,allanjsx/Ghost,gabfssilva/Ghost,patterncoder/patterncoder,load11/ghost,NovaDevelopGroup/Academy,jin/Ghost,pedroha/Ghost,lf2941270/Ghost,Sing-Li/GhostSS,dgem/Ghost,Elektro1776/javaPress,JonSmith/Ghost,JulienBrks/Ghost,kmeurer/Ghost,trunk-studio/Ghost,javorszky/Ghost,veyo-care/Ghost,janvt/Ghost,devleague/uber-hackathon,SachaG/bjjbot-blog,skmezanul/Ghost,camilodelvasto/herokughost,ignasbernotas/nullifer,mohanambati/Ghost,thehogfather/Ghost,VillainyStudios/Ghost,Netazoic/bad-gateway,Alxandr/Blog,k2byew/Ghost,zumobi/Ghost,zuphu/GhostBlog,JohnONolan/Ghost,LeandroNascimento/Ghost,mlabieniec/ghost-env,STANAPO/Ghost,vloom/blog,melissaroman/ghost-blog,NikolaiIvanov/Ghost,Aaron1992/Ghost,dYale/blog,Jai-Chaudhary/Ghost,SkynetInc/steam,rollokb/Ghost,greenboxindonesia/Ghost,SkynetInc/steam,KnowLoading/Ghost,codeincarnate/Ghost,carlosmtx/Ghost,ManRueda/manrueda-blog,gleneivey/Ghost,Dnlyc/Ghost,adam-paterson/blog,sebgie/Ghost,Empeeric/justanidea,floofydoug/Ghost,hnarayanan/narayanan.co,ghostchina/website,praveenscience/Ghost,stridespace/Ghost,dggr/Ghost-sr,leonli/ghost,lukw00/Ghost,aexmachina/blog-old,epicmiller/pages,sergeylukin/Ghost,JonSmith/Ghost,augbog/Ghost,cicorias/Ghost,disordinary/Ghost,hnq90/Ghost,dqj/Ghost,lanffy/Ghost,ivanoats/ivanstorck.com,wspandihai/Ghost,blankmaker/Ghost,tadityar/Ghost,woodyrew/Ghost,jgillich/Ghost,veyo-care/Ghost,ghostchina/Ghost-zh,aschmoe/jesse-ghost-app,obsoleted/Ghost,Sebastian1011/Ghost,stridespace/Ghost,jin/Ghost,ignasbernotas/nullifer,RufusMbugua/TheoryOfACoder,chris-yoon90/Ghost,kwangkim/Ghost,etanxing/Ghost,pbevin/Ghost,uniqname/everydaydelicious,davidmenger/nodejsfan,Dnlyc/Ghost,chevex/undoctrinate,Remchi/Ghost,claudiordgz/Ghost,shannonshsu/Ghost,klinker-apps/ghost,AnthonyCorrado/Ghost,smedrano/Ghost,JonathanZWhite/Ghost,dylanchernick/ghostblog,TribeMedia/Ghost,akveo/akveo-blog,neynah/GhostSS,dbalders/Ghost,developer-prosenjit/Ghost,katiefenn/Ghost,leonli/ghost,qdk0901/Ghost,VillainyStudios/Ghost,augbog/Ghost,avh4/blog.avh4.net,jomahoney/Ghost,cysys/ghost-openshift,acburdine/Ghost,achimos/ghost_as,johngeorgewright/blog.j-g-w.info,Loyalsoldier/Ghost,ryanbrunner/crafters,cncodog/Ghost-zh-codog,Kaenn/Ghost,Remchi/Ghost,bitjson/Ghost,JohnONolan/Ghost,andrewconnell/Ghost,achimos/ghost_as,Polyrhythm/dolce,Alxandr/Blog,dqj/Ghost,Feitianyuan/Ghost,ErisDS/Ghost,lowkeyfred/Ghost,javorszky/Ghost,sunh3/Ghost,manishchhabra/Ghost,barbastan/Ghost,kaychaks/kaushikc.org,smaty1/Ghost,GroupxDev/javaPress,cwonrails/Ghost,jomofrodo/ccb-ghost,ladislas/ghost,sunh3/Ghost,NovaDevelopGroup/Academy,ClarkGH/Ghost,influitive/crafters,mttschltz/ghostblog,ryansukale/ux.ryansukale.com,uploadcare/uploadcare-ghost-demo,llv22/Ghost,situkangsayur/Ghost,diancloud/Ghost,manishchhabra/Ghost,mayconxhh/Ghost,morficus/Ghost,letsjustfixit/Ghost,benstoltz/Ghost,panezhang/Ghost,hoxoa/Ghost,daimaqiao/Ghost-Bridge,tuan/Ghost,etdev/blog,Kikobeats/Ghost,TribeMedia/Ghost,mdbw/ghost,ErisDS/Ghost,flomotlik/Ghost,wangjun/Ghost,dymx101/Ghost,netputer/Ghost,ygbhf/Ghost,javimolla/Ghost,aschmoe/jesse-ghost-app,jparyani/GhostSS,shrimpy/Ghost,leninhasda/Ghost,Rovak/Ghost,virtuallyearthed/Ghost,fredeerock/atlabghost,Feitianyuan/Ghost,atandon/Ghost,alanmoo/moo-on-the-web,jparyani/GhostSS,dYale/blog,cgiffard/Ghost,bigertech/Ghost,acburdine/Ghost,icowan/Ghost,allspiritseve/mindlikewater,skleung/blog,prosenjit-itobuz/Ghost,daihuaye/Ghost,Shauky/Ghost,singular78/Ghost,psychobunny/Ghost,TryGhost/Ghost,choskim/Ghost,camilodelvasto/localghost,liftup/ghost,sceltoas/Ghost,sifatsultan/js-ghost,cobbspur/Ghost,rito/Ghost,yundt/seisenpenji,sajmoon/Ghost,Yarov/yarov,FredericBernardo/Ghost,v3rt1go/Ghost,ryansukale/ux.ryansukale.com,ashishapy/ghostpy,Xibao-Lv/Ghost,yangli1990/Ghost,Coding-House/Ghost,IbrahimAmin/Ghost,vainglori0us/urban-fortnight,johnnymitch/Ghost,mtvillwock/Ghost,jamesyothers/Ghost,beautyOfProgram/Ghost,julianromera/Ghost,bbmepic/Ghost,qdk0901/Ghost,Rovak/Ghost,ygbhf/Ghost,krahman/Ghost,RufusMbugua/TheoryOfACoder,10hacks/blog,situkangsayur/Ghost,mlabieniec/ghost-env,mohanambati/Ghost,cysys/ghost-openshift,ashishapy/ghostpy,ManRueda/Ghost,tadityar/Ghost,delgermurun/Ghost,ericbenson/GhostAzureSetup,choskim/GhostAzure,dymx101/Ghost,cwonrails/Ghost,olsio/Ghost,omaracrystal/Ghost,petersucks/blog,AileenCGN/Ghost,tchapi/igneet-blog,Yarov/yarov,davidenq/Ghost-Blog,novaugust/Ghost,Smile42RU/Ghost,francisco-filho/Ghost,novaugust/Ghost,djensen47/Ghost,lethalbrains/Ghost,eduardojmatos/eduardomatos.me,PeterCxy/Ghost,gcamana/Ghost,ineitzke/Ghost,alexandrachifor/Ghost,klinker-apps/ghost,davidblurton/salmondesign-old,diogogmt/Ghost,mtvillwock/Ghost,ClarkGH/Ghost,syaiful6/Ghost,Trendy/Ghost,denzelwamburu/denzel.xyz,ckousik/Ghost,MadeOnMars/Ghost,makapen/Ghost,devleague/uber-hackathon,ErisDS/Ghost,jaswilli/Ghost,BayPhillips/Ghost,Netazoic/bad-gateway,rizkyario/Ghost,sangcu/Ghost,schematical/Ghost,flpms/ghost-ad,exsodus3249/Ghost,TryGhost/Ghost,jamesslock/Ghost,tmp-reg/Ghost,liftup/ghost,sebgie/Ghost,atandon/Ghost,bsansouci/Ghost,UnbounDev/Ghost,woodyrew/Ghost,Kikobeats/Ghost,bosung90/Ghost,bisoe/Ghost,riyadhalnur/Ghost,imjerrybao/Ghost,wemakeweb/Ghost,denzelwamburu/denzel.xyz,netputer/Ghost,r14r/fork_nodejs_ghost,arvidsvensson/Ghost,tyrikio/Ghost,jacostag/Ghost,BlueHatbRit/Ghost,Japh/Ghost,duyetdev/islab,xiongjungit/Ghost,Romdeau/Ghost,PDXIII/Ghost-FormMailer,phillipalexander/Ghost,carlyledavis/Ghost,benstoltz/Ghost,lukaszklis/Ghost,ThorstenHans/Ghost,anijap/PhotoGhost,singular78/Ghost,jiangjian-zh/Ghost,diancloud/Ghost,bosung90/Ghost,rchrd2/Ghost,ballPointPenguin/Ghost,Brunation11/Ghost,JulienBrks/Ghost,cqricky/Ghost,kortemy/Ghost,jorgegilmoreira/ghost,10hacks/blog,vainglori0us/urban-fortnight,lukekhamilton/Ghost,alecho/Ghost,GroupxDev/javaPress,UsmanJ/Ghost,flomotlik/Ghost,sifatsultan/js-ghost,rameshponnada/Ghost,wallmarkets/Ghost,Klaudit/Ghost,no1lov3sme/Ghost,bsansouci/Ghost,nmukh/Ghost,Brunation11/Ghost,singular78/Ghost,memezilla/Ghost,vloom/blog,Bunk/Ghost,makapen/Ghost,fredeerock/atlabghost,jomofrodo/ccb-ghost,cwonrails/Ghost,lcamacho/Ghost,tksander/Ghost,praveenscience/Ghost,dggr/Ghost-sr,mnitchie/Ghost,ngosinafrica/SiteForNGOs,daimaqiao/Ghost-Bridge,ckousik/Ghost,jacostag/Ghost,dgem/Ghost,Japh/Ghost,edurangel/Ghost,RoopaS/demo-intern,handcode7/Ghost,dai-shi/Ghost,NamedGod/Ghost,thomasalrin/Ghost,wemakeweb/Ghost,rmoorman/Ghost,dggr/Ghost-sr,neynah/GhostSS,edsadr/Ghost,pensierinmusica/Ghost,etdev/blog,shrimpy/Ghost,daihuaye/Ghost,smedrano/Ghost,ghostchina/Ghost.zh,ddeveloperr/Ghost,sfpgmr/Ghost,epicmiller/pages,letsjustfixit/Ghost,kolorahl/Ghost,IbrahimAmin/Ghost,aroneiermann/GhostJade,developer-prosenjit/Ghost,kmeurer/GhostAzureSetup,bisoe/Ghost,MadeOnMars/Ghost,laispace/laiblog,ryanorsinger/tryghost,AnthonyCorrado/Ghost,freele/ghost,lukaszklis/Ghost,novaugust/Ghost,katrotz/blog.katrotz.space,Elektro1776/javaPress,Azzurrio/Ghost,ivantedja/ghost,optikalefx/Ghost,ngosinafrica/SiteForNGOs,Netazoic/bad-gateway,rafaelstz/Ghost,trunk-studio/Ghost,vishnuharidas/Ghost,kmeurer/Ghost,blankmaker/Ghost,wangjun/Ghost,ASwitlyk/Ghost,mattchupp/blog,mhhf/ghost-latex,anijap/PhotoGhost,mikecastro26/ghost-custom,djensen47/Ghost,patterncoder/patterncoder,ladislas/ghost,lukw00/Ghost,Romdeau/Ghost,mttschltz/ghostblog,skleung/blog,hilerchyn/Ghost,kevinansfield/Ghost,jaguerra/Ghost,letsjustfixit/Ghost,Netazoic/bad-gateway,rito/Ghost,UnbounDev/Ghost,tandrewnichols/ghost,PepijnSenders/whatsontheotherside,hyokosdeveloper/Ghost,jgillich/Ghost,theonlypat/Ghost,Bunk/Ghost,icowan/Ghost,hnarayanan/narayanan.co,Elektro1776/javaPress,thomasalrin/Ghost,allspiritseve/mindlikewater,jomofrodo/ccb-ghost,Jai-Chaudhary/Ghost,ManRueda/Ghost,rouanw/Ghost,lethalbrains/Ghost,Trendy/Ghost,ManRueda/manrueda-blog,Kaenn/Ghost,kolorahl/Ghost,cqricky/Ghost,panezhang/Ghost,nneko/Ghost,ananthhh/Ghost,ineitzke/Ghost,jorgegilmoreira/ghost,carlosmtx/Ghost,sangcu/Ghost,metadevfoundation/Ghost,lf2941270/Ghost,tanbo800/Ghost,YY030913/Ghost,BlueHatbRit/Ghost,ryanbrunner/crafters,kaiqigong/Ghost,davidmenger/nodejsfan,choskim/Ghost,johngeorgewright/blog.j-g-w.info,JonathanZWhite/Ghost,dylanchernick/ghostblog,rizkyario/Ghost,gleneivey/Ghost,Xibao-Lv/Ghost,rouanw/Ghost,axross/ghost,bitjson/Ghost,MrMaksimize/sdg1,rizkyario/Ghost,zhiyishou/Ghost,floofydoug/Ghost,rmoorman/Ghost,pedroha/Ghost,load11/ghost,memezilla/Ghost,davidenq/Ghost-Blog,tmp-reg/Ghost,kevinansfield/Ghost,rafaelstz/Ghost,yangli1990/Ghost,nakamuraapp/new-ghost,ananthhh/Ghost,madole/diverse-learners,zumobi/Ghost,Klaudit/Ghost,choskim/GhostAzure,Japh/shortcoffee,tidyui/Ghost,pollbox/ghostblog,metadevfoundation/Ghost,greyhwndz/Ghost,johnnymitch/Ghost,jorgegilmoreira/ghost,PeterCxy/Ghost,katrotz/blog.katrotz.space,imjerrybao/Ghost,leninhasda/Ghost,hnq90/Ghost,julianromera/Ghost,tyrikio/Ghost,stridespace/Ghost,mohanambati/Ghost,allanjsx/Ghost,pensierinmusica/Ghost,omaracrystal/Ghost,Kaenn/Ghost,vlmhco/personal-blog,davidenq/Ghost-Blog,madole/diverse-learners,influitive/crafters,leonli/ghost,UsmanJ/Ghost,Alxandr/Blog,prosenjit-itobuz/Ghost