Fix #1455 - Warn that attribute names should not contain spaces.
Fix #1455 - Warn that attribute names should not contain spaces.

embarknow/backbone,ppker/backbone,zhangwei001/backbone,jewsroch/backbone,dak/backbone,dillonforrest/backbone-df,zdespolit/backbone,amitpatange88/backbonejs,youprofit/backbone,lujocom/backbone,elma-cao/backbone,alekskorolev/lightbones,ohbarye/backbone,Niades/backbone,jridgewell/backbone,huanglp47/backbone,liudianpeng/backbone,linalu1/backbone,tadwhitaker/backbone,GerHobbelt/backbone,tibic/backbone,gougouGet/backbone,webapp/library,cailong1028/backbone,ThisIsManta/Backbone,wushuyi/backbone,mrblueblue/backbone,Niades/backbone,honger05/backbone,batigoal1980/backbone_example,GrimDerp/backbone,maryrosecook/backbone-df-2,FormidableLabs/backbone,edgeware/backbone,tzkKrbys/backbone,7213/backbone,sumyfly/backbone,embarknow/backbone,moimikey/backbone,vin100bk/backbone,craigmichaelmartin/backbone,craigmichaelmartin/backbone,Sachin-Ganesh/backbone,Akkuma/backbone,ereddate/backbone,kuychaco/backbone,wangcan2014/backbone,ThiagoGarciaAlves/backbone,timebackzhou/backbone,zdespolit/backbone,mrblueblue/backbone,webcoding/backbone,platinumazure/backbone,neocotic/hipbone,moimikey/backbone,dillonforrest/backbone-df-2,liudianpeng/backbone,yuhualingfeng/backbone,feychenie/backbone,ebsco/backbone,heroazure/backbone,gfranko/backbone,edgeware/backbone,dillonforrest/backbone-df,dak/backbone,vincent1988/backbone,anhtholee/backbone,premkumargithub/backbone,darrrk/backbone,rashmisajjan/backbone,mmolinastudio/backbone,webapp/library,ThiagoGarciaAlves/backbone,gdi2290/backbone,trizko/backbone,sunday-star/backbone,jmeas/backbone,tadwhitaker/backbone,chyeh727/backbone,braddunbar/backbone,7213/backbone,jashkenas/backbone,maryrosecook/backbone-df,wakanpaladin/mybackbone,akre54/backbone,npmcomponent/solutionio-backbone,Khan/backbone,sitexa/backbone,vincent1988/backbone,webcoding/backbone,Flip120/backbone,maryrosecook/backbone-df-2,paulfalgout/backbone,pandoraui/backbone,GerHobbelt/backbone,wangcan2014/backbone,hugohua/backbone,mpapp/backbone,ohbarye/backbone,jasoncbautista/backboneX,wakanpaladin/mybackbone,jordansexton/backboner,Krasnyanskiy/backbone,JesseQin/backbone,wxmfront/backbone,lastjune/backbone,neocotic/hipbone,closeio/backbone,yawenl/backbone,howtolearntocode/backbone,Flip120/backbone,zhangdimelody/backbone,linalu1/backbone,Krasnyanskiy/backbone,ntgn81/backbone,componentizr/backbone,tibic/backbone,nvoron23/backbone,maryrosecook/backbone-df,elancom/backbone,jungjung917/backbone,FishbaitHarry/backbone,ridixcr/backbone,LovelyL25/backbone.js,tzkKrbys/backbone,oss-practice/backbone,ereddate/backbone,paulfalgout/backbone,sueyeh/backbone,guigrpa/backbone,jewsroch/backbone,trizko/backbone,zgl2007dj/backbone,kuychaco/backbone,alekskorolev/lightbones,gmaclennan/backbone,Aplopio/backbone,zgl2007dj/backbone,Bug2014/backbone,cgvarela/backbone,au-phiware/backbone,fanhc019/backbone,nvoron23/backbone,leimd/backbone,Diwahars/backbone,dillonforrest/backbone-df,rjz/boneless,yuhualingfeng/backbone,pandoraui/backbone,jstrimpel/backbone,cailong1028/backbone,zhangwei001/backbone,youprofit/backbone,rashmisajjan/backbone,wangdahoo/backbone,DannyDelott/backbone,jashkenas/backbone,elma-cao/backbone,jungjung917/backbone,amitpatange88/backbonejs,braddunbar/backbone,Aplopio/backbone,sueyeh/backbone,jstrimpel/backbone,dcheepurupalli/backbone,sumyfly/backbone,ywenjinlin/backbone,npmcomponent/jashkenas-backbone,Sachin-Ganesh/backbone,Connectlegendary/backbone,streamablevideo/backbone,Khan/backbone,Diwahars/backbone,tgriesser/backbone,maryrosecook/backbone-df,sitexa/backbone,Aplopio/backbone,anhtholee/backbone,chyeh727/backbone,maryrosecook/backbone-df-2,ThisIsManta/Backbone,yawenl/backbone,Khan/backbone,au-phiware/backbone,leimd/backbone,wxmfront/backbone,IsoldaJS/isolda-models,elancom/backbone,IsoldaJS/isolda-pubsub,ebsco/backbone,platinumazure/backbone,amdjs/backbone,howtolearntocode/backbone,wangdahoo/backbone,zhangdimelody/backbone,jridgewell/backbone,moccen/backbone,Bug2014/backbone,getshuvo/backbone,aihua/backbone,mmolinastudio/backbone,lujocom/backbone,luffy94608/backbone,gitterHQ/backbone,sunday-star/backbone,GrimDerp/backbone,JesseQin/backbone,megawac/backbone,gougouGet/backbone,timebackzhou/backbone,nikolas/backbone,LovelyL25/backbone.js,moccen/backbone,gfranko/backbone,premkumargithub/backbone,ywenjinlin/backbone,ntgn81/backbone,streamablevideo/backbone,wushuyi/backbone,getshuvo/backbone,dillonforrest/backbone-df-2,closeio/backbone,fanhc019/backbone,akre54/backbone,ridixcr/backbone,virtru-components/backbone,dillonforrest/backbone-df-2,lastjune/backbone,dcheepurupalli/backbone,batigoal1980/backbone_example,heroazure/backbone,darrrk/backbone,Connectlegendary/backbone,udhayam/backbone,antoniogarrote/backbone,feychenie/backbone,honger05/backbone,vin100bk/backbone,luffy94608/backbone,DannyDelott/backbone,guahanweb/backbone,zhoufan879/backbone,huanglp47/backbone,nikolas/backbone,gmaclennan/backbone,zhoufan879/backbone,udhayam/backbone,wjb12/backbone,npmcomponent/solutionio-backbone,wjb12/backbone,FishbaitHarry/backbone,ppker/backbone,jmeas/backbone,guahanweb/backbone,cgvarela/backbone,aihua/backbone