Added option to support manually specified discovery URI.

git-svn-id: https://google-api-ruby-client.googlecode.com/svn/trunk@101 c1d61fac-ed7f-fcc1-18f7-ff78120a04ef

spec/google/api_client/discovery_spec.rb

@@ -156,6 +156,8 @@ describe Google::APIClient, 'configured for the prediction API' do
       Google::APIClient::Service.new('two', 'v2', {})
     @client.discovered_services <<
       Google::APIClient::Service.new('two', 'v2beta1', {})
+    @client.discovered_services <<
+      Google::APIClient::Service.new('two', 'test2', {})
     @client.latest_service_version('two').version.should == 'v2'
   end