Remove all duplication the specs

S3 and Swift now run the same specs. The only difference is the before
block that defines the stubbed HTTP requests and the responses from the
Swift and S3 servers

Gemfile

@@ -15,6 +15,7 @@ group :test do
   gem 'purdytest', :require => false
   gem 'm'
   gem 'minitest-stub_any_instance'
+  gem 'webmock'
 end
 
 group :staging, :production do