Added asserts for overriding -subscribe:.
Added asserts for overriding -subscribe:.

ikesyo/ReactiveCocoa,nickcheng/ReactiveCocoa,beni55/ReactiveCocoa,juliangrosshauser/ReactiveCocoa,yytong/ReactiveCocoa,loupman/ReactiveCocoa,xulibao/ReactiveCocoa,OneSmallTree/ReactiveCocoa,ioshger0125/ReactiveCocoa,dz1111/ReactiveCocoa,BrooksWon/ReactiveCocoa,natan/ReactiveCocoa,Ricowere/ReactiveCocoa,huiping192/ReactiveCocoa,valleyman86/ReactiveCocoa,j364960953/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,takeshineshiro/ReactiveCocoa,howandhao/ReactiveCocoa,bscarano/ReactiveCocoa,natestedman/ReactiveCocoa,longv2go/ReactiveCocoa,cnbin/ReactiveCocoa,cstars135/ReactiveCocoa,200895045/ReactiveCocoa,hj3938/ReactiveCocoa,xiaoliyang/ReactiveCocoa,shaohung001/ReactiveCocoa,jianwoo/ReactiveCocoa,calebd/ReactiveCocoa,on99/ReactiveCocoa,buildo/ReactiveCocoa,Eveian/ReactiveCocoa,lixar/ReactiveCocoa,bencochran/ReactiveCocoa,yaoxiaoyong/ReactiveCocoa,bencochran/ReactiveCocoa,ShawnLeee/ReactiveCocoa,msdgwzhy6/ReactiveCocoa,paulyoung/ReactiveCocoa,victorlin/ReactiveCocoa,ShawnLeee/ReactiveCocoa,tipbit/ReactiveCocoa,natan/ReactiveCocoa,sugar2010/ReactiveCocoa,leelili/ReactiveCocoa,zhiwen1024/ReactiveCocoa,terry408911/ReactiveCocoa,gabemdev/ReactiveCocoa,yonekawa/ReactiveCocoa,howandhao/ReactiveCocoa,chieryw/ReactiveCocoa,cnbin/ReactiveCocoa,eyu1988/ReactiveCocoa,sdhzwm/ReactiveCocoa,335g/ReactiveCocoa,jam891/ReactiveCocoa,sdhzwm/ReactiveCocoa,dskatz22/ReactiveCocoa,wpstarnice/ReactiveCocoa,eliperkins/ReactiveCocoa,Ricowere/ReactiveCocoa,xulibao/ReactiveCocoa,Ray0218/ReactiveCocoa,walkingsmarts/ReactiveCocoa,taylormoonxu/ReactiveCocoa,imkerberos/ReactiveCocoa,stevielu/ReactiveCocoa,ikesyo/ReactiveCocoa,valleyman86/ReactiveCocoa,leelili/ReactiveCocoa,jrmiddle/ReactiveCocoa,AlanJN/ReactiveCocoa,BlessNeo/ReactiveCocoa,ohwutup/ReactiveCocoa,335g/ReactiveCocoa,zhigang1992/ReactiveCocoa,calebd/ReactiveCocoa,OneSmallTree/ReactiveCocoa,CQXfly/ReactiveCocoa,takeshineshiro/ReactiveCocoa,andersio/ReactiveCocoa,juliangrosshauser/ReactiveCocoa,chieryw/ReactiveCocoa,zzzworm/ReactiveCocoa,Pingco/ReactiveCocoa,ericzhou2008/ReactiveCocoa,Pingco/ReactiveCocoa,Remitly/ReactiveCocoa,emodeqidao/ReactiveCocoa,jeelun/ReactiveCocoa,qq644531343/ReactiveCocoa,zhenlove/ReactiveCocoa,xiaoliyang/ReactiveCocoa,stevielu/ReactiveCocoa,BlessNeo/ReactiveCocoa,leichunfeng/ReactiveCocoa,jaylib/ReactiveCocoa,ShawnLeee/ReactiveCocoa,Adlai-Holler/ReactiveCocoa,cstars135/ReactiveCocoa,ddc391565320/ReactiveCocoa,kiurentu/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,yoichitgy/ReactiveCocoa,hoanganh6491/ReactiveCocoa,SanChain/ReactiveCocoa,yytong/ReactiveCocoa,Juraldinio/ReactiveCocoa,nikita-leonov/ReactiveCocoa,msdgwzhy6/ReactiveCocoa,isghe/ReactiveCocoa,windgo/ReactiveCocoa,jackywpy/ReactiveCocoa,SanChain/ReactiveCocoa,cogddo/ReactiveCocoa,kaylio/ReactiveCocoa,wpstarnice/ReactiveCocoa,fhchina/ReactiveCocoa,jackywpy/ReactiveCocoa,msdgwzhy6/ReactiveCocoa,CCOOOOLL/ReactiveCocoa,zhukaixy/ReactiveCocoa,KJin99/ReactiveCocoa,hoanganh6491/ReactiveCocoa,mattpetters/ReactiveCocoa,Remitly/ReactiveCocoa,brightcove/ReactiveCocoa,Pingco/ReactiveCocoa,zxq3220122/ReactiveCocoa,koamac/ReactiveCocoa,pzw224/ReactiveCocoa,jeelun/ReactiveCocoa,tiger8888/ReactiveCocoa,Rupert-RR/ReactiveCocoa,Adlai-Holler/ReactiveCocoa,j364960953/ReactiveCocoa,CQXfly/ReactiveCocoa,DreamHill/ReactiveCocoa,FelixYin66/ReactiveCocoa,Rupert-RR/ReactiveCocoa,koamac/ReactiveCocoa,taylormoonxu/ReactiveCocoa,llb1119/test,PSPDFKit-labs/ReactiveCocoa,tornade0913/ReactiveCocoa,335g/ReactiveCocoa,BrooksWon/ReactiveCocoa,windgo/ReactiveCocoa,loupman/ReactiveCocoa,brasbug/ReactiveCocoa,CCOOOOLL/ReactiveCocoa,tornade0913/ReactiveCocoa,tzongw/ReactiveCocoa,eyu1988/ReactiveCocoa,hilllinux/ReactiveCocoa,CCOOOOLL/ReactiveCocoa,richeterre/ReactiveCocoa,shaohung001/ReactiveCocoa,stevielu/ReactiveCocoa,llb1119/test,zhenlove/ReactiveCocoa,howandhao/ReactiveCocoa,jsslai/ReactiveCocoa,qq644531343/ReactiveCocoa,koamac/ReactiveCocoa,KJin99/ReactiveCocoa,cogddo/ReactiveCocoa,zxq3220122/ReactiveCocoa,Pikdays/ReactiveCocoa,yangyangluoluo/ReactiveCocoa,JohnJin007/ReactiveCocoa,itschaitanya/ReactiveCocoa,almassapargali/ReactiveCocoa,ceekayel/ReactiveCocoa,icepy/ReactiveCocoa,fhchina/ReactiveCocoa,ddc391565320/ReactiveCocoa,Eveian/ReactiveCocoa,tzongw/ReactiveCocoa,yizzuide/ReactiveCocoa,AndyZhaoHe/ReactiveCocoa,zxq3220122/ReactiveCocoa,FelixYin66/ReactiveCocoa,Ethan89/ReactiveCocoa,tonyarnold/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,jaylib/ReactiveCocoa,zhaoguohui/ReactiveCocoa,sugar2010/ReactiveCocoa,yaoxiaoyong/ReactiveCocoa,ioshger0125/ReactiveCocoa,OnTheWay1988/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,leichunfeng/ReactiveCocoa,wpstarnice/ReactiveCocoa,yizzuide/ReactiveCocoa,yonekawa/ReactiveCocoa,JohnJin007/ReactiveCocoa,AllanChen/ReactiveCocoa,eliperkins/ReactiveCocoa,lixar/ReactiveCocoa,hj3938/ReactiveCocoa,clg0118/ReactiveCocoa,SuPair/ReactiveCocoa,ceekayel/ReactiveCocoa,mtxs007/ReactiveCocoa,add715/ReactiveCocoa,jrmiddle/ReactiveCocoa,SmartEncounter/ReactiveCocoa,goodheart/ReactiveCocoa,xumaolin/ReactiveCocoa,cnbin/ReactiveCocoa,buildo/ReactiveCocoa,Farteen/ReactiveCocoa,smilypeda/ReactiveCocoa,bensonday/ReactiveCocoa,nikita-leonov/ReactiveCocoa,vincentiss/ReactiveCocoa,mattpetters/ReactiveCocoa,zhukaixy/ReactiveCocoa,tonyli508/ReactiveCocoa,luerhouhou/ReactiveCocoa,bensonday/ReactiveCocoa,gabemdev/ReactiveCocoa,JackLian/ReactiveCocoa,stupidfive/ReactiveCocoa,hj3938/ReactiveCocoa,huiping192/ReactiveCocoa,Remitly/ReactiveCocoa,beni55/ReactiveCocoa,natestedman/ReactiveCocoa,rpowelll/ReactiveCocoa,paulyoung/ReactiveCocoa,WEIBP/ReactiveCocoa,leelili/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,WEIBP/ReactiveCocoa,SuPair/ReactiveCocoa,takeshineshiro/ReactiveCocoa,Ricowere/ReactiveCocoa,victorlin/ReactiveCocoa,liufeigit/ReactiveCocoa,smilypeda/ReactiveCocoa,kevin-zqw/ReactiveCocoa,JackLian/ReactiveCocoa,tzongw/ReactiveCocoa,llb1119/test,goodheart/ReactiveCocoa,wangqi211/ReactiveCocoa,ddc391565320/ReactiveCocoa,richeterre/ReactiveCocoa,Carthage/ReactiveCocoa,lixar/ReactiveCocoa,DongDongDongDong/ReactiveCocoa,kaylio/ReactiveCocoa,zhigang1992/ReactiveCocoa,nickcheng/ReactiveCocoa,alvinvarghese/ReactiveCocoa,ailyanlu/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,jackywpy/ReactiveCocoa,dskatz22/ReactiveCocoa,AlanJN/ReactiveCocoa,leichunfeng/ReactiveCocoa,on99/ReactiveCocoa,gengjf/ReactiveCocoa,mattpetters/ReactiveCocoa,Khan/ReactiveCocoa,mxxiv/ReactiveCocoa,xiaobing2007/ReactiveCocoa,dz1111/ReactiveCocoa,tiger8888/ReactiveCocoa,goodheart/ReactiveCocoa,xiaoliyang/ReactiveCocoa,monkeydbobo/ReactiveCocoa,Ethan89/ReactiveCocoa,ohwutup/ReactiveCocoa,AndyZhaoHe/ReactiveCocoa,natan/ReactiveCocoa,icepy/ReactiveCocoa,zhaoguohui/ReactiveCocoa,icepy/ReactiveCocoa,AllanChen/ReactiveCocoa,SuPair/ReactiveCocoa,PSPDFKit-labs/ReactiveCocoa,tonyarnold/ReactiveCocoa,wangqi211/ReactiveCocoa,brightcove/ReactiveCocoa,200895045/ReactiveCocoa,esttorhe/ReactiveCocoa,luerhouhou/ReactiveCocoa,AlanJN/ReactiveCocoa,Khan/ReactiveCocoa,Khan/ReactiveCocoa,brasbug/ReactiveCocoa,DreamHill/ReactiveCocoa,itschaitanya/ReactiveCocoa,sujeking/ReactiveCocoa,KuPai32G/ReactiveCocoa,yizzuide/ReactiveCocoa,zzqiltw/ReactiveCocoa,JackLian/ReactiveCocoa,LHDsimon/ReactiveCocoa,walkingsmarts/ReactiveCocoa,buildo/ReactiveCocoa,terry408911/ReactiveCocoa,vincentiss/ReactiveCocoa,ceekayel/ReactiveCocoa,DreamHill/ReactiveCocoa,Liquidsoul/ReactiveCocoa,yangyangluoluo/ReactiveCocoa,KJin99/ReactiveCocoa,qq644531343/ReactiveCocoa,ohwutup/ReactiveCocoa,yonekawa/ReactiveCocoa,fanghao085/ReactiveCocoa,pzw224/ReactiveCocoa,sandyway/ReactiveCocoa,AndyZhaoHe/ReactiveCocoa,Farteen/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,Eveian/ReactiveCocoa,hbucius/ReactiveCocoa,hbucius/ReactiveCocoa,dz1111/ReactiveCocoa,jeelun/ReactiveCocoa,luerhouhou/ReactiveCocoa,kiurentu/ReactiveCocoa,xumaolin/ReactiveCocoa,loupman/ReactiveCocoa,Juraldinio/ReactiveCocoa,libiao88/ReactiveCocoa,sandyway/ReactiveCocoa,zzqiltw/ReactiveCocoa,shuxiashusheng/ReactiveCocoa,add715/ReactiveCocoa,towik/ReactiveCocoa,OnTheWay1988/ReactiveCocoa,LHDsimon/ReactiveCocoa,nickcheng/ReactiveCocoa,sujeking/ReactiveCocoa,tonyli508/ReactiveCocoa,andersio/ReactiveCocoa,jsslai/ReactiveCocoa,richeterre/ReactiveCocoa,hilllinux/ReactiveCocoa,on99/ReactiveCocoa,KuPai32G/ReactiveCocoa,zhiwen1024/ReactiveCocoa,alvinvarghese/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,Carthage/ReactiveCocoa,natestedman/ReactiveCocoa,jam891/ReactiveCocoa,longv2go/ReactiveCocoa,shaohung001/ReactiveCocoa,FelixYin66/ReactiveCocoa,chao95957/ReactiveCocoa,terry408911/ReactiveCocoa,dskatz22/ReactiveCocoa,hoanganh6491/ReactiveCocoa,clg0118/ReactiveCocoa,beni55/ReactiveCocoa,monkeydbobo/ReactiveCocoa,dullgrass/ReactiveCocoa,eyu1988/ReactiveCocoa,rpowelll/ReactiveCocoa,brasbug/ReactiveCocoa,xulibao/ReactiveCocoa,chao95957/ReactiveCocoa,kevin-zqw/ReactiveCocoa,tonyarnold/ReactiveCocoa,DongDongDongDong/ReactiveCocoa,zzzworm/ReactiveCocoa,JohnJin007/ReactiveCocoa,victorlin/ReactiveCocoa,emodeqidao/ReactiveCocoa,yangyangluoluo/ReactiveCocoa,GuitarPlayer-Ma/ReactiveCocoa,dullgrass/ReactiveCocoa,stupidfive/ReactiveCocoa,SmartEncounter/ReactiveCocoa,ioshger0125/ReactiveCocoa,imkerberos/ReactiveCocoa,almassapargali/ReactiveCocoa,swizzlr/ReactiveCocoa,zzzworm/ReactiveCocoa,pzw224/ReactiveCocoa,KuPai32G/ReactiveCocoa,esttorhe/ReactiveCocoa,Farteen/ReactiveCocoa,clg0118/ReactiveCocoa,jrmiddle/ReactiveCocoa,vincentiss/ReactiveCocoa,ztchena/ReactiveCocoa,Ricowere/ReactiveCocoa,kiurentu/ReactiveCocoa,LHDsimon/ReactiveCocoa,wangqi211/ReactiveCocoa,Liquidsoul/ReactiveCocoa,add715/ReactiveCocoa,Pikdays/ReactiveCocoa,towik/ReactiveCocoa,Rupert-RR/ReactiveCocoa,libiao88/ReactiveCocoa,ztchena/ReactiveCocoa,jianwoo/ReactiveCocoa,tipbit/ReactiveCocoa,paulyoung/ReactiveCocoa,dachaoisme/ReactiveCocoa,bencochran/ReactiveCocoa,Juraldinio/ReactiveCocoa,monkeydbobo/ReactiveCocoa,sugar2010/ReactiveCocoa,zzqiltw/ReactiveCocoa,jsslai/ReactiveCocoa,GuitarPlayer-Ma/ReactiveCocoa,dachaoisme/ReactiveCocoa,mxxiv/ReactiveCocoa,OnTheWay1988/ReactiveCocoa,SanChain/ReactiveCocoa,Adlai-Holler/ReactiveCocoa,andersio/ReactiveCocoa,almassapargali/ReactiveCocoa,swizzlr/ReactiveCocoa,fanghao085/ReactiveCocoa,gengjf/ReactiveCocoa,zhigang1992/ReactiveCocoa,bscarano/ReactiveCocoa,Carthage/ReactiveCocoa,sdhzwm/ReactiveCocoa,BlessNeo/ReactiveCocoa,cstars135/ReactiveCocoa,yaoxiaoyong/ReactiveCocoa,GuitarPlayer-Ma/ReactiveCocoa,ailyanlu/ReactiveCocoa,towik/ReactiveCocoa,xumaolin/ReactiveCocoa,emodeqidao/ReactiveCocoa,stupidfive/ReactiveCocoa,huiping192/ReactiveCocoa,chao95957/ReactiveCocoa,juliangrosshauser/ReactiveCocoa,BrooksWon/ReactiveCocoa,Pikdays/ReactiveCocoa,dachaoisme/ReactiveCocoa,libiao88/ReactiveCocoa,Ethan89/ReactiveCocoa,ericzhou2008/ReactiveCocoa,dullgrass/ReactiveCocoa,yoichitgy/ReactiveCocoa,zhiwen1024/ReactiveCocoa,eliperkins/ReactiveCocoa,j364960953/ReactiveCocoa,isghe/ReactiveCocoa,jam891/ReactiveCocoa,chieryw/ReactiveCocoa,liufeigit/ReactiveCocoa,mtxs007/ReactiveCocoa,brightcove/ReactiveCocoa,imkerberos/ReactiveCocoa,walkingsmarts/ReactiveCocoa,nickcheng/ReactiveCocoa,yoichitgy/ReactiveCocoa,jianwoo/ReactiveCocoa,ericzhou2008/ReactiveCocoa,fhchina/ReactiveCocoa,cogddo/ReactiveCocoa,tornade0913/ReactiveCocoa,tiger8888/ReactiveCocoa,zhukaixy/ReactiveCocoa,tonyli508/ReactiveCocoa,bscarano/ReactiveCocoa,ztchena/ReactiveCocoa,200895045/ReactiveCocoa,zhenlove/ReactiveCocoa,esttorhe/ReactiveCocoa,gengjf/ReactiveCocoa,longv2go/ReactiveCocoa,CQXfly/ReactiveCocoa,zhaoguohui/ReactiveCocoa,smilypeda/ReactiveCocoa,OneSmallTree/ReactiveCocoa,jaylib/ReactiveCocoa,nikita-leonov/ReactiveCocoa,valleyman86/ReactiveCocoa,jaylib/ReactiveCocoa,shuxiashusheng/ReactiveCocoa,windgo/ReactiveCocoa,Ray0218/ReactiveCocoa,esttorhe/ReactiveCocoa,mxxiv/ReactiveCocoa,WEIBP/ReactiveCocoa,shuxiashusheng/ReactiveCocoa,kaylio/ReactiveCocoa,mtxs007/ReactiveCocoa,PSPDFKit-labs/ReactiveCocoa,alvinvarghese/ReactiveCocoa,sujeking/ReactiveCocoa,taylormoonxu/ReactiveCocoa,bensonday/ReactiveCocoa,calebd/ReactiveCocoa,sandyway/ReactiveCocoa,itschaitanya/ReactiveCocoa,liufeigit/ReactiveCocoa,yytong/ReactiveCocoa,kevin-zqw/ReactiveCocoa,ailyanlu/ReactiveCocoa,Liquidsoul/ReactiveCocoa,huiping192/ReactiveCocoa,isghe/ReactiveCocoa,xiaobing2007/ReactiveCocoa,hilllinux/ReactiveCocoa,hbucius/ReactiveCocoa,DongDongDongDong/ReactiveCocoa,rpowelll/ReactiveCocoa,xiaobing2007/ReactiveCocoa,fanghao085/ReactiveCocoa,Ray0218/ReactiveCocoa