Clean up references on both listener and listened objects
Clean up references on both listener and listened objects

elancom/backbone,dak/backbone,elancom/backbone,streamablevideo/backbone,embarknow/backbone,Bug2014/backbone,Bug2014/backbone,tibic/backbone,platinumazure/backbone,darrrk/backbone,moccen/backbone,craigmichaelmartin/backbone,jmeas/backbone,ntgn81/backbone,neocotic/hipbone,yuhualingfeng/backbone,premkumargithub/backbone,timebackzhou/backbone,linalu1/backbone,cgvarela/backbone,yuhualingfeng/backbone,gougouGet/backbone,zhangwei001/backbone,au-phiware/backbone,aihua/backbone,ThiagoGarciaAlves/backbone,ThiagoGarciaAlves/backbone,feychenie/backbone,jashkenas/backbone,GrimDerp/backbone,zdespolit/backbone,nikolas/backbone,jungjung917/backbone,embarknow/backbone,FishbaitHarry/backbone,dcheepurupalli/backbone,Flip120/backbone,nikolas/backbone,wxmfront/backbone,zhangwei001/backbone,akre54/backbone,7213/backbone,tadwhitaker/backbone,braddunbar/backbone,closeio/backbone,IsoldaJS/isolda-pubsub,aihua/backbone,udhayam/backbone,wangcan2014/backbone,cailong1028/backbone,jridgewell/backbone,guahanweb/backbone,tzkKrbys/backbone,streamablevideo/backbone,moccen/backbone,lastjune/backbone,mrblueblue/backbone,zhangdimelody/backbone,ohbarye/backbone,wangcan2014/backbone,leimd/backbone,howtolearntocode/backbone,gougouGet/backbone,ridixcr/backbone,Diwahars/backbone,ntgn81/backbone,fanhc019/backbone,leimd/backbone,Sachin-Ganesh/backbone,chyeh727/backbone,jmeas/backbone,moimikey/backbone,zhoufan879/backbone,huanglp47/backbone,paulfalgout/backbone,ppker/backbone,braddunbar/backbone,premkumargithub/backbone,closeio/backbone,Diwahars/backbone,yawenl/backbone,Niades/backbone,GrimDerp/backbone,vin100bk/backbone,akre54/backbone,heroazure/backbone,anhtholee/backbone,Connectlegendary/backbone,Flip120/backbone,neocotic/hipbone,vincent1988/backbone,youprofit/backbone,Connectlegendary/backbone,FishbaitHarry/backbone,ereddate/backbone,ohbarye/backbone,Niades/backbone,alekskorolev/lightbones,ywenjinlin/backbone,sunday-star/backbone,7213/backbone,wangdahoo/backbone,rashmisajjan/backbone,trizko/backbone,alekskorolev/lightbones,chyeh727/backbone,youprofit/backbone,tibic/backbone,ppker/backbone,sunday-star/backbone,liudianpeng/backbone,heroazure/backbone,anhtholee/backbone,lastjune/backbone,DannyDelott/backbone,Sachin-Ganesh/backbone,ywenjinlin/backbone,gmaclennan/backbone,fanhc019/backbone,wjb12/backbone,dcheepurupalli/backbone,Krasnyanskiy/backbone,vincent1988/backbone,elma-cao/backbone,getshuvo/backbone,pandoraui/backbone,guahanweb/backbone,lujocom/backbone,elma-cao/backbone,cailong1028/backbone,howtolearntocode/backbone,zhangdimelody/backbone,tadwhitaker/backbone,lujocom/backbone,sueyeh/backbone,au-phiware/backbone,zgl2007dj/backbone,zhoufan879/backbone,wushuyi/backbone,jewsroch/backbone,jashkenas/backbone,sumyfly/backbone,udhayam/backbone,getshuvo/backbone,timebackzhou/backbone,sumyfly/backbone,huanglp47/backbone,moimikey/backbone,wxmfront/backbone,platinumazure/backbone,sitexa/backbone,tzkKrbys/backbone,craigmichaelmartin/backbone,jridgewell/backbone,yawenl/backbone,sitexa/backbone,feychenie/backbone,liudianpeng/backbone,sueyeh/backbone,dak/backbone,IsoldaJS/isolda-models,jungjung917/backbone,trizko/backbone,darrrk/backbone,wjb12/backbone,vin100bk/backbone,wushuyi/backbone,paulfalgout/backbone,cgvarela/backbone,pandoraui/backbone,jewsroch/backbone,ridixcr/backbone,Krasnyanskiy/backbone,ereddate/backbone,gmaclennan/backbone,rashmisajjan/backbone,DannyDelott/backbone,mrblueblue/backbone,zdespolit/backbone,wangdahoo/backbone,zgl2007dj/backbone,linalu1/backbone