Merge pull request rspec#2022 from rspec/pin-aruba

Pin aruba to a version that works on all the rubies we support.

Author: myronmarston

rspec-core.gemspec

@@ -40,7 +40,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency "rake",     "~> 10.0.0"
   s.add_development_dependency "cucumber", "~> 1.3"
   s.add_development_dependency "minitest", "~> 5.3"
-  s.add_development_dependency "aruba",    "~> 0.6"
+  s.add_development_dependency "aruba",    "~> 0.6.2" # 0.7 is broken on ruby 1.8.7
 
   s.add_development_dependency "nokogiri", (RUBY_VERSION < '1.9.3' ? "1.5.2" : "~> 1.5")
   s.add_development_dependency "coderay",  "~> 1.0.9"