added a note in the readme about the extensions
added a note in the readme about the extensions

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