generate JUnit test output

This is helpful when running the tests in the Bluemix DevOps pipeline

.gitignore

@@ -4,3 +4,4 @@ coverage/*.html
 blue-green-deploy.*
 artefacts/
 Godeps/_workspace
+junit.xml

cf_green_blue_deploy_suite_test.go

@@ -2,12 +2,14 @@ package main_test
 
 import (
 	. "github.com/onsi/ginkgo"
+	"github.com/onsi/ginkgo/reporters"
 	. "github.com/onsi/gomega"
 
 	"testing"
 )
 
 func TestCfGreenBlueDeploy(t *testing.T) {
 	RegisterFailHandler(Fail)
-	RunSpecs(t, "CfGreenBlueDeploy Suite")
+	junitReporter := reporters.NewJUnitReporter("junit.xml")
+	RunSpecsWithDefaultAndCustomReporters(t, "CfGreenBlueDeploy Suite", []Reporter{junitReporter})
 }