Bump RSpec 3 test dependency to 3.0 stable

Author: skalee

gemfiles/rspec3.gemfile

@@ -4,6 +4,6 @@ gemspec :path => '..'
 
 group :test do
   gem "cucumber", "~> 1.1", ">= 1.1.1"
-  gem "rspec", ">= 3.0.0.beta2", "< 4.0"
+  gem "rspec", "~> 3.0"
   gem "rake", "~> 10.0"
 end