Add last(), single(), and wait() to ColdSignal
Add last(), single(), and wait() to ColdSignal

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Cocoa,libiao88/ReactiveCocoa,BrooksWon/ReactiveCocoa,richeterre/ReactiveCocoa,dz1111/ReactiveCocoa,ericzhou2008/ReactiveCocoa,ceekayel/ReactiveCocoa,llb1119/test,icepy/ReactiveCocoa,Pingco/ReactiveCocoa,on99/ReactiveCocoa,richeterre/ReactiveCocoa,FelixYin66/ReactiveCocoa,calebd/ReactiveCocoa,fhchina/ReactiveCocoa,OneSmallTree/ReactiveCocoa,KuPai32G/ReactiveCocoa,windgo/ReactiveCocoa,buildo/ReactiveCocoa,jam891/ReactiveCocoa,JackLian/ReactiveCocoa,cogddo/ReactiveCocoa,huiping192/ReactiveCocoa,valleyman86/ReactiveCocoa,Liquidsoul/ReactiveCocoa,vincentiss/ReactiveCocoa,lixar/ReactiveCocoa,j364960953/ReactiveCocoa,DongDongDongDong/ReactiveCocoa,xulibao/ReactiveCocoa,wangqi211/ReactiveCocoa,alvinvarghese/ReactiveCocoa,hbucius/ReactiveCocoa,zzzworm/ReactiveCocoa,Ethan89/ReactiveCocoa,tonyli508/ReactiveCocoa,rpowelll/ReactiveCocoa,terry408911/ReactiveCocoa,nickcheng/ReactiveCocoa,chao95957/ReactiveCocoa,mattpetters/ReactiveCocoa,zxq3220122/ReactiveCocoa,sandyway/ReactiveCocoa,FelixYin66/ReactiveCocoa,jaylib/ReactiveCocoa,j364960953/ReactiveCocoa,BrooksWon/ReactiveCocoa,zhenlove/ReactiveCocoa,kiurentu/ReactiveCocoa,Ricowere/ReactiveCocoa,almassapargali/ReactiveCocoa,CCOOOOLL/ReactiveCocoa,zhaoguohui/ReactiveCocoa,smilypeda/ReactiveCocoa,SuPair/ReactiveCocoa,mtxs007/ReactiveCocoa,CQXfly/ReactiveCocoa,stevielu/ReactiveCocoa,Ethan89/ReactiveCocoa,kiurentu/ReactiveCocoa,DreamHill/ReactiveCocoa,sandyway/ReactiveCocoa,CQXfly/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,yonekawa/ReactiveCocoa,victorlin/ReactiveCocoa,luerhouhou/ReactiveCocoa,hj3938/ReactiveCocoa,Pingco/ReactiveCocoa,xiaoliyang/ReactiveCocoa,xumaolin/ReactiveCocoa,windgo/ReactiveCocoa,zhiwen1024/ReactiveCocoa,cnbin/ReactiveCocoa,buildo/ReactiveCocoa,BlessNeo/ReactiveCocoa,LHDsimon/ReactiveCocoa,emodeqidao/ReactiveCocoa,cstars135/ReactiveCocoa,msdgwzhy6/ReactiveCocoa,200895045/ReactiveCocoa,BrooksWon/ReactiveCocoa,richeterre/ReactiveCocoa,calebd/ReactiveCocoa,zhukaixy/ReactiveCocoa,dullgrass/ReactiveCocoa,tzongw/ReactiveCocoa,pzw224/ReactiveCocoa,victorlin/ReactiveCocoa,cnbin/ReactiveCocoa,jackywpy/ReactiveCocoa,cogddo/ReactiveCocoa,j364960953/ReactiveCocoa,Liquidsoul/ReactiveCocoa,cogddo/ReactiveCocoa,DongDongDongDong/ReactiveCocoa,goodheart/ReactiveCocoa,juliangrosshauser/ReactiveCocoa,dachaoisme/ReactiveCocoa,zhigang1992/ReactiveCocoa,llb1119/test,tonyli508/ReactiveCocoa,huiping192/ReactiveCocoa,yytong/ReactiveCocoa,Ricowere/ReactiveCocoa,hoanganh6491/ReactiveCocoa,pzw224/ReactiveCocoa,monkeydbobo/ReactiveCocoa,smilypeda/ReactiveCocoa,PSPDFKit-labs/ReactiveCocoa,Farteen/ReactiveCocoa,hj3938/ReactiveCocoa,tiger8888/ReactiveCocoa,KuPai32G/ReactiveCocoa,tonyarnold/ReactiveCocoa,GuitarPlayer-Ma/ReactiveCocoa,hilllinux/ReactiveCocoa,stevielu/ReactiveCocoa,qq644531343/ReactiveCocoa,Juraldinio/ReactiveCocoa,Eveian/ReactiveCocoa,vincentiss/ReactiveCocoa,howandhao/ReactiveCocoa,ikesyo/ReactiveCocoa,KJin99/ReactiveCocoa,gengjf/ReactiveCocoa,nickcheng/ReactiveCocoa,ShawnLeee/ReactiveCocoa,bscarano/ReactiveCocoa,almassapargali/ReactiveCocoa,hilllinux/ReactiveCocoa,JohnJin007/ReactiveCocoa,libiao88/ReactiveCocoa,dachaoisme/ReactiveCocoa,mattpetters/ReactiveCocoa,shuxiashusheng/ReactiveCocoa,PSPDFKit-labs/ReactiveCocoa,hoanganh6491/ReactiveCocoa,ceekayel/ReactiveCocoa,smilypeda/ReactiveCocoa,zzqiltw/ReactiveCocoa,dskatz22/ReactiveCocoa,wpstarnice/ReactiveCocoa,xumaolin/ReactiveCocoa,WEIBP/ReactiveCocoa,Liquidsoul/ReactiveCocoa,esttorhe/ReactiveCocoa,Khan/ReactiveCocoa,Juraldinio/ReactiveCocoa,taylormoonxu/ReactiveCocoa,BlessNeo/ReactiveCocoa,ioshger0125/ReactiveCocoa,itschaitanya/ReactiveCocoa,dullgrass/ReactiveCocoa,CCOOOOLL/ReactiveCocoa,yaoxiaoyong/ReactiveCocoa,pzw224/ReactiveCocoa,andersio/ReactiveCocoa,llb1119/test,sujeking/ReactiveCocoa,stupidfive/ReactiveCocoa,huiping192/ReactiveCocoa,walkingsmarts/ReactiveCocoa,libiao88/ReactiveCocoa,icepy/ReactiveCocoa,jaylib/ReactiveCocoa,zhiwen1024/ReactiveCocoa,tiger8888/ReactiveCocoa,xumaolin/ReactiveCocoa,sujeking/ReactiveCocoa,andersio/ReactiveCocoa,sandyway/ReactiveCocoa,isghe/ReactiveCocoa,tornade0913/ReactiveCocoa,yoichitgy/ReactiveCocoa,loupman/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,AlanJN/ReactiveCocoa,jsslai/ReactiveCocoa,chieryw/ReactiveCocoa,Khan/ReactiveCocoa,WEIBP/ReactiveCocoa,JackLian/ReactiveCocoa,ohwutup/ReactiveCocoa,tzongw/ReactiveCocoa,shaohung001/ReactiveCocoa,xiaobing2007/ReactiveCocoa,jackywpy/ReactiveCocoa,xiaoliyang/ReactiveCocoa,tzongw/ReactiveCocoa,ohwutup/ReactiveCocoa,jsslai/ReactiveCocoa,andersio/ReactiveCocoa,hbucius/ReactiveCocoa,kaylio/ReactiveCocoa,chao95957/ReactiveCocoa,jeelun/ReactiveCocoa,jaylib/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,clg0118/ReactiveCocoa,chieryw/ReactiveCocoa,howandhao/ReactiveCocoa,OnTheWay1988/ReactiveCocoa,liufeigit/ReactiveCocoa,eyu1988/ReactiveCocoa,taylormoonxu/ReactiveCocoa,yonekawa/ReactiveCocoa,stupidfive/ReactiveCocoa,CQXfly/ReactiveCocoa,on99/ReactiveCocoa,JohnJin007/ReactiveCocoa,windgo/ReactiveCocoa,tornade0913/ReactiveCocoa,CCOOOOLL/ReactiveCocoa,2008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