updated rspec version to 3.0.0 (Release Candidate 1)
added rspec-its gem (it was removed from rspec-core)
replaced calls to be_true and be_false for be_truthy and be_falsey (new in rspec 3)
converted all the should matchers to expect matchers (new default)
removed the treat symbols as true values setting from rspec (deprecated and true by default)