updated matchers to work with rspec 3.0.0
updated matchers to work with rspec 3.0.0

MetricMike/cancancan,dgynn/cancancan,dima4p/cancancan,chenxin0723/cancancan,adamliesko/cancancan,macmartine/cancancan-ruby,coorasse/cancancan,jhawthorn/cancancan,GeorgeZhukov/cancancan,NelsonScott/cancancan,neomadara/cancancan,Ahnita/cancancan,gdpelican/cancancan,ReaxDev/cancancan,CanCanCommunity/cancancan,chadzilla2080/cancancan,nerde/cancancan,phallguy/cancancan,tiarly/cancancan