Fixed Chartist.extend definition to support multiple parameters.
Fixed Chartist.extend definition to support multiple parameters.

daptiv/DefinitelyTyped,use-strict/DefinitelyTyped,chrootsu/DefinitelyTyped,pocesar/DefinitelyTyped,trystanclarke/DefinitelyTyped,wilfrem/DefinitelyTyped,arusakov/DefinitelyTyped,johan-gorter/DefinitelyTyped,stephenjelfs/DefinitelyTyped,emanuelhp/DefinitelyTyped,behzad888/DefinitelyTyped,martinduparc/DefinitelyTyped,mcrawshaw/DefinitelyTyped,Pro/DefinitelyTyped,jimthedev/DefinitelyTyped,xStrom/DefinitelyTyped,sledorze/DefinitelyTyped,frogcjn/DefinitelyTyped,philippstucki/DefinitelyTyped,sclausen/DefinitelyTyped,nakakura/DefinitelyTyped,mattblang/DefinitelyTyped,georgemarshall/DefinitelyTyped,florentpoujol/DefinitelyTyped,mattblang/DefinitelyTyped,aciccarello/DefinitelyTyped,EnableSoftware/DefinitelyTyped,gcastre/DefinitelyTyped,nitintutlani/DefinitelyTyped,borisyankov/DefinitelyTyped,MugeSo/DefinitelyTyped,abner/DefinitelyTyped,Dashlane/DefinitelyTyped,danfma/DefinitelyTyped,psnider/DefinitelyTyped,paulmorphy/DefinitelyTyped,wilfrem/DefinitelyTyped,dsebastien/DefinitelyTyped,HPFOD/DefinitelyTyped,mareek/DefinitelyTyped,nfriend/DefinitelyTyped,alexdresko/DefinitelyTyped,slavomirvojacek/DefinitelyTyped,CodeZombieCH/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,nobuoka/DefinitelyTyped,abbasmhd/DefinitelyTyped,UzEE/DefinitelyTyped,progre/DefinitelyTyped,OpenMaths/DefinitelyTyped,syuilo/DefinitelyTyped,alvarorahul/DefinitelyTyped,stacktracejs/DefinitelyTyped,xStrom/DefinitelyTyped,Penryn/DefinitelyTyped,gandjustas/DefinitelyTyped,newclear/DefinitelyTyped,martinduparc/DefinitelyTyped,scriby/DefinitelyTyped,pwelter34/DefinitelyTyped,DzmitryDulko/DefinitelyTyped,yuit/DefinitelyTyped,benishouga/DefinitelyTyped,alexdresko/DefinitelyTyped,raijinsetsu/DefinitelyTyped,benishouga/DefinitelyTyped,borisyankov/DefinitelyTyped,nakakura/DefinitelyTyped,laurentiustamate94/DefinitelyTyped,AgentME/DefinitelyTyped,psnider/DefinitelyTyped,rolandzwaga/DefinitelyTyped,ryan10132/DefinitelyTyped,gcastre/DefinitelyTyped,axelcostaspena/DefinitelyTyped,hellopao/DefinitelyTyped,progre/DefinitelyTyped,smrq/DefinitelyTyped,EnableSoftware/DefinitelyTyped,schmuli/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,zuzusik/DefinitelyTyped,psnider/DefinitelyTyped,sclausen/DefinitelyTyped,eugenpodaru/DefinitelyTyped,benishouga/DefinitelyTyped,aciccarello/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,shlomiassaf/DefinitelyTyped,slavomirvojacek/adbrain-typescript-definitions,amanmahajan7/DefinitelyTyped,nainslie/DefinitelyTyped,arusakov/DefinitelyTyped,tan9/DefinitelyTyped,pocesar/DefinitelyTyped,Litee/DefinitelyTyped,rcchen/DefinitelyTyped,magny/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,trystanclarke/DefinitelyTyped,subash-a/DefinitelyTyped,georgemarshall/DefinitelyTyped,schmuli/DefinitelyTyped,one-pieces/DefinitelyTyped,vagarenko/DefinitelyTyped,amanmahajan7/DefinitelyTyped,Zzzen/DefinitelyTyped,musicist288/DefinitelyTyped,mhegazy/DefinitelyTyped,donnut/DefinitelyTyped,QuatroCode/DefinitelyTyped,subash-a/DefinitelyTyped,amir-arad/DefinitelyTyped,ashwinr/DefinitelyTyped,pocesar/DefinitelyTyped,YousefED/DefinitelyTyped,yuit/DefinitelyTyped,slavomirvojacek/DefinitelyTyped,nainslie/DefinitelyTyped,magny/DefinitelyTyped,mareek/DefinitelyTyped,nycdotnet/DefinitelyTyped,ryan-codingintrigue/DefinitelyTyped,minodisk/DefinitelyTyped,aciccarello/DefinitelyTyped,Zzzen/DefinitelyTyped,mhegazy/DefinitelyTyped,frogcjn/DefinitelyTyped,jraymakers/DefinitelyTyped,arusakov/DefinitelyTyped,damianog/DefinitelyTyped,Pro/DefinitelyTyped,donnut/DefinitelyTyped,micurs/DefinitelyTyped,slavomirvojacek/adbrain-typescript-definitions,syuilo/DefinitelyTyped,zuzusik/DefinitelyTyped,mcliment/DefinitelyTyped,newclear/DefinitelyTyped,pwelter34/DefinitelyTyped,martinduparc/DefinitelyTyped,georgemarshall/DefinitelyTyped,abbasmhd/DefinitelyTyped,chrootsu/DefinitelyTyped,schmuli/DefinitelyTyped,abner/DefinitelyTyped,isman-usoh/DefinitelyTyped,DzmitryDulko/DefinitelyTyped,HPFOD/DefinitelyTyped,stacktracejs/DefinitelyTyped,danfma/DefinitelyTyped,greglo/DefinitelyTyped,benliddicott/DefinitelyTyped,AgentME/DefinitelyTyped,raijinsetsu/DefinitelyTyped,Ptival/DefinitelyTyped,vagarenko/DefinitelyTyped,isman-usoh/DefinitelyTyped,reppners/DefinitelyTyped,reppners/DefinitelyTyped,jimthedev/DefinitelyTyped,stephenjelfs/DefinitelyTyped,QuatroCode/DefinitelyTyped,flyfishMT/DefinitelyTyped,flyfishMT/DefinitelyTyped,alextkachman/DefinitelyTyped,arma-gast/DefinitelyTyped,gandjustas/DefinitelyTyped,dsebastien/DefinitelyTyped,alextkachman/DefinitelyTyped,scriby/DefinitelyTyped,damianog/DefinitelyTyped,Penryn/DefinitelyTyped,rolandzwaga/DefinitelyTyped,tan9/DefinitelyTyped,emanuelhp/DefinitelyTyped,sledorze/DefinitelyTyped,rcchen/DefinitelyTyped,zuzusik/DefinitelyTyped,smrq/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,Softpagehomeware/DefinitelyTyped,Softpagehomeware/DefinitelyTyped,MugeSo/DefinitelyTyped,georgemarshall/DefinitelyTyped,hellopao/DefinitelyTyped,OpenMaths/DefinitelyTyped,jraymakers/DefinitelyTyped,Ptival/DefinitelyTyped,minodisk/DefinitelyTyped,chrismbarr/DefinitelyTyped,philippstucki/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