Bump rspec-core to 2.6.4
Bump rspec-core to 2.6.4

trakt/forem,kot-begemot/forem,BanzaiMan/forem,BoboFraggins/forem,rdy/forem,wuwx/forem,frankmarineau/forem,RostDetal/forem,devleoper/forem,ajeje/forem,ketanjain/forem,trakt/forem,kenmazaika/forem,kl/forem,0xCCD/forem,bodrovis/forem,ch000/forem,RostDetal/forem,tomrc/forem,nikolaevav/forem,prasadrails/forem,eivindhagen/forem,Fullscreen/forem,ascendbruce/forem,jaybrueder/forem,frankmarineau/forem,xenonn/forem,ciscou/forem,hanspolo/forem,rubysherpas/forem,mijoharas/forem,zshannon/forem,knewter/forem,bcavileer/forem,abrambailey/forem,wuwx/forem,zhublik/forem,syndicut/forem,netjungle/forem,SamLau95/forem,devleoper/forem,frankmarineau/forem,tomkrus/forem,beansmile/forem,radar/forem,knewter/forem,renz45/forem,ketanjain/forem,tomrc/forem,jarray52/forem,joneslee85/forem,tonic20/forem,radar/forem,nikolaevav/forem,devleoper/forem,mumoc/forem,rdy/forem,syndicut/forem,juozasg/forem,jarray52/forem,BoboFraggins/forem,etjossem/Goodsmiths-Hub,code-mancers/forem,bodrovis/forem,mmcc/forem,kot-begemot/forem,tonic20/forem,mauriciopasquier/forem,hanspolo/forem,mhoad/forem,bbatsov/forem,gabriel-dehan/forem,link-er/forem,BanzaiMan/forem,impact11/forem-rd,mauriciopasquier/forem,zhublik/forem,hepu/forem,code-mancers/forem,brooks/forem,Amirhb/forem,Amirhb/forem,gabriel-dehan/forem,bagusyuu/forem,ascendbruce/forem,codev/forem,rubysherpas/forem,bbatsov/forem,abrambailey/forem,link-er/forem,mhoad/forem,tomrc/forem,etjossem/Goodsmiths-Hub,prasadrails/forem,kamarcum/forem,rubysherpas/forem,beefsack/forem,moh-alsheikh/forem,efrence/forem,trakt/forem,ch000/forem,netjungle/forem,danman01/forem,yan-hoose/forem,RostDetal/forem,jeremyong/forem,elm-city-craftworks/forem,amwelles/forem,jaybrueder/forem,bcavileer/forem,kunalchaudhari/forem,juozasg/forem,wuwx/forem,SamLau95/forem,tomkrus/forem,hepu/forem,zshannon/forem,mmcc/forem,wesleycho/forem,nikolaevav/forem,wesleycho/forem,beansmile/forem,NOX73/forem,sandboxrem/forem,mumoc/forem,beefsack/forem,Fullscreen/forem,elm-city-craftworks/forem,yan-hoose/forem,kl/forem,kamarcum/forem,moh-alsheikh/forem,mijoharas/forem,efrence/forem,amwelles/forem,ajeje/forem,NOX73/forem,joneslee85/forem,radar/forem,bvsatyaram/forem,hanspolo/forem,renz45/forem,bagusyuu/forem,daniely/forem,xenonn/forem,sandboxrem/forem,zhublik/forem,jeremyong/forem,codev/forem,danman01/forem,jaybrueder/forem,eivindhagen/forem,andypike/forem,efrence/forem,0xCCD/forem,bvsatyaram/forem,impact11/forem-rd,brooks/forem,ciscou/forem,andypike/forem,kunalchaudhari/forem,ketanjain/forem,daniely/forem,impact11/forem-rd,kenmazaika/forem,ajeje/forem