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)
Merge pull request #12 from TiagoCardoso1983/master

Added support for rspec 3