Add support for project-wide JSLint config.
Add support for project-wide JSLint config.

Related to issues #3269, #4210.
Based on the discussion and suggestions in #3310.

If a project has a .jslint.json in its root, it gets loaded and passed to each
JSLint run within the project. The configuration file gets reloaded each time
it is saved or refreshed.

SebastianBoyd/sebastianboyd.github.io-OLD,quasto/ArduinoStudio,StephanieMak/brackets,wangjun/brackets,RobertJGabriel/brackets,malinkie/brackets,L0g1k/brackets,zhukaixy/brackets,rafaelstz/brackets,fcjailybo/brackets,goldcase/brackets,RamirezWillow/brackets,zLeonjo/brackets,dtcom/MyPSDBracket,IAmAnubhavSaini/brackets,tan9/brackets,udhayam/brackets,lovewitty/brackets,humphd/brackets,Cartman0/brackets,adrianhartanto0/brackets,stowball/brackets,michaeljayt/brackets,gwynndesign/brackets,MantisWare/brackets,SebastianBoyd/sebastianboyd.github.io-OLD,jmarkina/brackets,emanziano/brackets,baig/brackets,netlams/brackets,srhbinion/brackets,mcanthony/brackets,cdot-brackets-extensions/nimble-htmlLint,bidle/brackets,falcon1812/brackets,Mosoc/brackets,sedge/nimble,Real-Currents/brackets,SidBala/brackets,arduino-org/ArduinoStudio,Mosoc/brackets,SidBala/brackets,FTG-003/brackets,emanziano/brackets,ScalaInc/brackets,shal1y/brackets,robertkarlsson/brackets,netlams/brackets,stowball/brackets,ricciozhang/brackets,ForkedRepos/brackets,gcommetti/brackets,revi/brackets,NGHGithub/brackets,Real-Currents/brackets,FTG-003/brackets,ficristo/brackets,2youyouo2/cocoslite,albertinad/brackets,pratts/brackets,fronzec/brackets,dangkhue27/brackets,mat-mcloughlin/brackets,Th30/brackets,jiawenbo/brackets,cdot-brackets-extensions/nimble-htmlLint,resir014/brackets,sprintr/brackets,sgupta7857/brackets,shal1y/brackets,jiawenbo/brackets,goldcase/brackets,NGHGithub/brackets,chambej/brackets,zLeonjo/brackets,cosmosgenius/brackets,Fcmam5/brackets,albertinad/brackets,massimiliano76/brackets,ashleygwilliams/brackets,kolipka/brackets,fastrde/brackets,Rajat-dhyani/brackets,adobe/brackets,gcommetti/brackets,Real-Currents/brackets,brianjking/brackets,y12uc231/brackets,ralic/brackets,chinnyannieb/brackets,gideonthomas/brackets,phillipalexander/brackets,srhbinion/brackets,wakermahmud/brackets,siddharta1337/brackets,jiimaho/brackets,L0g1k/brackets,resir014/brackets,ropik/brackets,pratts/brackets,zhukaixy/brackets,michaeljayt/brackets,Pomax/brackets,wakermahmud/brackets,tan9/brackets,Fcmam5/brackets,hanmichael/brackets,adrianhartanto0/brackets,Wikunia/brackets,kolipka/brackets,hanmichael/brackets,StephanieMak/brackets,shiyamkumar/brackets,jiimaho/brackets,amrelnaggar/brackets,jacobnash/brackets,NickersF/brackets,eric-stanley/brackets,macdg/brackets,ChaofengZhou/brackets,ScalaInc/brackets,flukeout/brackets,adrianhartanto0/brackets,shiyamkumar/brackets,abhisekp/brackets,dangkhue27/brackets,Lojsan123/brackets,weebygames/brackets,mjurczyk/brackets,bidle/brackets,fabricadeaplicativos/brackets,rafaelstz/brackets,baig/brackets,baig/brackets,MahadevanSrinivasan/brackets,ralic/brackets,Cartman0/brackets,dangkhue27/brackets,uwsd/brackets,dtcom/MyPSDBracket,humphd/brackets,srhbinion/brackets,quasto/ArduinoStudio,Live4Code/brackets,bidle/brackets,keir-rex/brackets,macdg/brackets,StephanieMak/brackets,robertkarlsson/brackets,xantage/brackets,sophiacaspar/brackets,riselabs-ufba/RiPLE-HC-ExperimentalData,JordanTheriault/brackets,NKcentinel/brackets,petetnt/brackets,Cartman0/brackets,y12uc231/brackets,jiimaho/brackets,Rynaro/brackets,treejames/brackets,iamchathu/brackets,baig/brackets,ls2uper/brackets,adobe/brackets,fabricadeaplicativos/brackets,zaggino/brackets-electron,ralic/brackets,NGHGithub/brackets,Jonavin/brackets,Pomax/brackets,simon66/brackets,ashleygwilliams/brackets,treejames/brackets,karevn/brackets,sophiacaspar/brackets,Wikunia/brackets,busykai/brackets,srinivashappy/brackets,mcanthony/brackets,alicoding/nimble,Lojsan123/brackets,ecwebservices/brackets,riselabs-ufba/RiPLE-HC-ExperimentalData,gcommetti/brackets,abhisekp/brackets,dtcom/MyPSDBracket,flukeout/brackets,nucliweb/brackets,Th30/brackets,andrewnc/brackets,ralic/brackets,RobertJGabriel/brackets,andrewnc/brackets,Lojsan123/brackets,malinkie/brackets,chambej/brackets,NKcentinel/brackets,Jonavin/brackets,gideonthomas/brackets,arduino-org/ArduinoStudio,uwsd/brackets,2youyouo2/cocoslite,Andrey-Pavlov/brackets,chambej/brackets,FTG-003/brackets,amrelnaggar/brackets,michaeljayt/brackets,zaggino/brackets-electron,raygervais/brackets,tan9/brackets,Cartman0/brackets,y12uc231/brackets,chinnyannieb/brackets,chrisle/brackets,Free-Technology-Guild/brackets,ecwebservices/brackets,fcjailybo/brackets,zLeonjo/brackets,Live4Code/brackets,pkdevbox/brackets,michaeljayt/brackets,GHackAnonymous/brackets,SebastianBoyd/sebastianboyd.github.io-OLD,zLeonjo/brackets,richmondgozarin/brackets,FTG-003/brackets,andrewnc/brackets,quasto/ArduinoStudio,cdot-brackets-extensions/nimble-htmlLint,2youyouo2/cocoslite,thr0w/brackets,2youyouo2/cocoslite,riselabs-ufba/RiPLE-HC-ExperimentalData,rafaelstz/brackets,ScalaInc/brackets,ecwebservices/brackets,MarcelGerber/brackets,xantage/brackets,shiyamkumar/brackets,udhayam/brackets,sedge/nimble,thr0w/brackets,IAmAnubhavSaini/brackets,sophiacaspar/brackets,veveykocute/brackets,NGHGithub/brackets,No9/brackets,treejames/brackets,82488059/brackets,wesleifreitas/brackets,ChaofengZhou/brackets,ChaofengZhou/brackets,emanziano/brackets,gupta-tarun/brackets,Rajat-dhyani/brackets,youprofit/brackets,m66n/brackets,fronzec/brackets,mjurczyk/brackets,phillipalexander/brackets,xantage/brackets,RamirezWillow/brackets,ropik/brackets,Th30/brackets,jacobnash/brackets,adobe/brackets,macdg/brackets,eric-stanley/brackets,2youyouo2/cocoslite,karevn/brackets,thehogfather/brackets,Fcmam5/brackets,jiawenbo/brackets,MantisWare/brackets,robertkarlsson/brackets,lovewitty/brackets,Rajat-dhyani/brackets,goldcase/brackets,IAmAnubhavSaini/brackets,Fcmam5/brackets,MantisWare/brackets,ls2uper/brackets,abhisekp/brackets,ricciozhang/brackets,udhayam/brackets,JordanTheriault/brackets,rlugojr/brackets,treejames/brackets,Free-Technology-Guild/brackets,humphd/brackets,mjurczyk/brackets,hanmichael/brackets,No9/brackets,fashionsun/brackets,Live4Code/brackets,weebygames/brackets,revi/brackets,eric-stanley/brackets,weebygames/brackets,iamchathu/brackets,raygervais/brackets,sgupta7857/brackets,chrisle/brackets,RobertJGabriel/brackets,lovewitty/brackets,thehogfather/brackets,lunode/brackets,andrewnc/brackets,thr0w/brackets,phillipalexander/brackets,sophiacaspar/brackets,chinnyannieb/brackets,weebygames/brackets,cosmosgenius/brackets,flukeout/brackets,No9/brackets,show0017/brackets,wangjun/brackets,fcjailybo/brackets,quasto/ArduinoStudio,MarcelGerber/brackets,No9/brackets,wangjun/brackets,NickersF/brackets,mcanthony/brackets,srinivashappy/brackets,srhbinion/brackets,wakermahmud/brackets,GHackAnonymous/brackets,CapeSepias/brackets,SidBala/brackets,Rynaro/brackets,ralic/brackets,JordanTheriault/brackets,ls2uper/brackets,ecwebservices/brackets,chambej/brackets,NickersF/brackets,L0g1k/brackets,busykai/brackets,sgupta7857/brackets,thehogfather/brackets,m66n/brackets,chrisle/brackets,fvntr/brackets,Denisov21/brackets,mjurczyk/brackets,veveykocute/brackets,Live4Code/brackets,albertinad/brackets,Jonavin/brackets,stowball/brackets,mozilla/brackets,MahadevanSrinivasan/brackets,hanmichael/brackets,sgupta7857/brackets,alexkid64/brackets,abhisekp/brackets,kilroy23/brackets,IAmAnubhavSaini/brackets,uwsd/brackets,zaggino/brackets-electron,zaggino/brackets-electron,jiawenbo/brackets,CapeSepias/brackets,cosmosgenius/brackets,falcon1812/brackets,GHackAnonymous/brackets,SebastianBoyd/sebastianboyd.github.io-OLD,srinivashappy/brackets,marcominetti/brackets,Andrey-Pavlov/brackets,sprintr/brackets,petetnt/brackets,michaeljayt/brackets,shiyamkumar/brackets,brianjking/brackets,Rynaro/brackets,alicoding/nimble,massimiliano76/brackets,Rajat-dhyani/brackets,Mosoc/brackets,Mosoc/brackets,revi/brackets,jmarkina/brackets,JordanTheriault/brackets,MarcelGerber/brackets,MahadevanSrinivasan/brackets,agreco/brackets,Fcmam5/brackets,shal1y/brackets,robertkarlsson/brackets,alicoding/nimble,Free-Technology-Guild/brackets,iamchathu/brackets,SidBala/brackets,humphd/brackets,marcominetti/brackets,show0017/brackets,SidBala/brackets,ricciozhang/brackets,ashleygwilliams/brackets,ChaofengZhou/brackets,rlugojr/brackets,nucliweb/brackets,No9/brackets,ricciozhang/brackets,TylerL-uxai/brackets,Rajat-dhyani/brackets,nucliweb/brackets,riselabs-ufba/RiPLE-HC-ExperimentalData,ficristo/brackets,fronzec/brackets,Real-Currents/brackets,arduino-org/ArduinoStudio,veveykocute/brackets,gwynndesign/brackets,netlams/brackets,rlugojr/brackets,malinkie/brackets,gcommetti/brackets,adobe/brackets,zaggino/brackets-electron,uwsd/brackets,alexkid64/brackets,Andrey-Pavlov/brackets,ashleygwilliams/brackets,SebastianBoyd/sebastianboyd.github.io-OLD,gideonthomas/brackets,y12uc231/brackets,CapeSepias/brackets,TylerL-uxai/brackets,udhayam/brackets,macdg/brackets,andrewnc/brackets,pkdevbox/brackets,siddharta1337/brackets,wesleifreitas/brackets,tan9/brackets,richmondgozarin/brackets,pkdevbox/brackets,m66n/brackets,Lojsan123/brackets,lunode/brackets,rafaelstz/brackets,agreco/brackets,ashleygwilliams/brackets,massimiliano76/brackets,mat-mcloughlin/brackets,albertinad/brackets,Th30/brackets,fashionsun/brackets,gupta-tarun/brackets,sprintr/brackets,falcon1812/brackets,shiyamkumar/brackets,wesleifreitas/brackets,RamirezWillow/brackets,petetnt/brackets,fastrde/brackets,petetnt/brackets,show0017/brackets,pomadgw/brackets,rafaelstz/brackets,Th30/brackets,mozilla/brackets,gupta-tarun/brackets,mozilla/brackets,jacobnash/brackets,thehogfather/brackets,riselabs-ufba/RiPLE-HC-ExperimentalData,Denisov21/brackets,Lojsan123/brackets,lovewitty/brackets,ricciozhang/brackets,shal1y/brackets,MantisWare/brackets,arduino-org/ArduinoStudio,gwynndesign/brackets,ggusman/present,pratts/brackets,macdg/brackets,MahadevanSrinivasan/brackets,hanmichael/brackets,Andrey-Pavlov/brackets,MantisWare/brackets,kolipka/brackets,NKcentinel/brackets,fastrde/brackets,Free-Technology-Guild/brackets,cdot-brackets-extensions/nimble-htmlLint,revi/brackets,chinnyannieb/brackets,keir-rex/brackets,ficristo/brackets,Pomax/brackets,treejames/brackets,adrianhartanto0/brackets,fashionsun/brackets,mcanthony/brackets,karevn/brackets,ForkedRepos/brackets,chrismoulton/brackets,brianjking/brackets,zLeonjo/brackets,amrelnaggar/brackets,CapeSepias/brackets,TylerL-uxai/brackets,jiimaho/brackets,nucliweb/brackets,pomadgw/brackets,ls2uper/brackets,jiimaho/brackets,karevn/brackets,ggusman/present,wangjun/brackets,ropik/brackets,raygervais/brackets,Denisov21/brackets,dangkhue27/brackets,tan9/brackets,fastrde/brackets,busykai/brackets,NickersF/brackets,resir014/brackets,revi/brackets,82488059/brackets,lunode/brackets,pratts/brackets,sedge/nimble,ficristo/brackets,82488059/brackets,fvntr/brackets,bidle/brackets,keir-rex/brackets,siddharta1337/brackets,amrelnaggar/brackets,fronzec/brackets,quasto/ArduinoStudio,simon66/brackets,kolipka/brackets,stowball/brackets,pkdevbox/brackets,zhukaixy/brackets,gcommetti/brackets,eric-stanley/brackets,veveykocute/brackets,resir014/brackets,iamchathu/brackets,chambej/brackets,wakermahmud/brackets,richmondgozarin/brackets,sgupta7857/brackets,CapeSepias/brackets,sophiacaspar/brackets,abhisekp/brackets,Rynaro/brackets,ggusman/present,sedge/nimble,keir-rex/brackets,alexkid64/brackets,adobe/brackets,raygervais/brackets,adrianhartanto0/brackets,fcjailybo/brackets,RobertJGabriel/brackets,ForkedRepos/brackets,ggusman/present,lunode/brackets,rlugojr/brackets,Pomax/brackets,chrismoulton/brackets,xantage/brackets,iamchathu/brackets,flukeout/brackets,Andrey-Pavlov/brackets,busykai/brackets,emanziano/brackets,kilroy23/brackets,veveykocute/brackets,kilroy23/brackets,srhbinion/brackets,chinnyannieb/brackets,siddharta1337/brackets,gwynndesign/brackets,NickersF/brackets,goldcase/brackets,pomadgw/brackets,jmarkina/brackets,ficristo/brackets,chrisle/brackets,wangjun/brackets,chrismoulton/brackets,dtcom/MyPSDBracket,jacobnash/brackets,L0g1k/brackets,weebygames/brackets,youprofit/brackets,thr0w/brackets,chrismoulton/brackets,MahadevanSrinivasan/brackets,xantage/brackets,pkdevbox/brackets,srinivashappy/brackets,ForkedRepos/brackets,youprofit/brackets,Rynaro/brackets,jmarkina/brackets,Mosoc/brackets,arduino-org/ArduinoStudio,mozilla/brackets,fronzec/brackets,richmondgozarin/brackets,simon66/brackets,amrelnaggar/brackets,Pomax/brackets,mjurczyk/brackets,Wikunia/brackets,falcon1812/brackets,baig/brackets,fvntr/brackets,raygervais/brackets,zaggino/brackets-electron,alexkid64/brackets,ScalaInc/brackets,Real-Currents/brackets,brianjking/brackets,thr0w/brackets,netlams/brackets,karevn/brackets,TylerL-uxai/brackets,keir-rex/brackets,youprofit/brackets,fabricadeaplicativos/brackets,chrisle/brackets,goldcase/brackets,dangkhue27/brackets,fabricadeaplicativos/brackets,kilroy23/brackets,udhayam/brackets,resir014/brackets,zhukaixy/brackets,netlams/brackets,NKcentinel/brackets,brianjking/brackets,alexkid64/brackets,bidle/brackets,mcanthony/brackets,fvntr/brackets,riselabs-ufba/RiPLE-HC-ExperimentalData,fabricadeaplicativos/brackets,GHackAnonymous/brackets,humphd/brackets,82488059/brackets,NKcentinel/brackets,wesleifreitas/brackets,wesleifreitas/brackets,stowball/brackets,gupta-tarun/brackets,pratts/brackets,kolipka/brackets,mozilla/brackets,mat-mcloughlin/brackets,pomadgw/brackets,falcon1812/brackets,uwsd/brackets,ls2uper/brackets,sprintr/brackets,GHackAnonymous/brackets,fcjailybo/brackets,Real-Currents/brackets,gideonthomas/brackets,emanziano/brackets,shal1y/brackets,pomadgw/brackets,busykai/brackets,rlugojr/brackets,MarcelGerber/brackets,zhukaixy/brackets,jmarkina/brackets,kilroy23/brackets,show0017/brackets,TylerL-uxai/brackets,simon66/brackets,JordanTheriault/brackets,sedge/nimble,flukeout/brackets,mat-mcloughlin/brackets,ChaofengZhou/brackets,massimiliano76/brackets,ecwebservices/brackets,RobertJGabriel/brackets,alicoding/nimble,richmondgozarin/brackets,sprintr/brackets,ropik/brackets,albertinad/brackets,jacobnash/brackets,IAmAnubhavSaini/brackets,fashionsun/brackets,fastrde/brackets,siddharta1337/brackets,Jonavin/brackets,petetnt/brackets,thehogfather/brackets,RamirezWillow/brackets,simon66/brackets,ForkedRepos/brackets,Denisov21/brackets,robertkarlsson/brackets,RamirezWillow/brackets,ScalaInc/brackets,gideonthomas/brackets,agreco/brackets,m66n/brackets,82488059/brackets,lunode/brackets,gupta-tarun/brackets,malinkie/brackets,phillipalexander/brackets,jiawenbo/brackets,phillipalexander/brackets,fashionsun/brackets,Wikunia/brackets,srinivashappy/brackets,lovewitty/brackets,NGHGithub/brackets,youprofit/brackets,Denisov21/brackets,fvntr/brackets,Jonavin/brackets,cosmosgenius/brackets,y12uc231/brackets,wakermahmud/brackets,Cartman0/brackets,malinkie/brackets,MarcelGerber/brackets,FTG-003/brackets,StephanieMak/brackets,nucliweb/brackets,Wikunia/brackets,agreco/brackets,eric-stanley/brackets,m66n/brackets,Free-Technology-Guild/brackets,Live4Code/brackets,chrismoulton/brackets,massimiliano76/brackets,StephanieMak/brackets