Option to print output into report, when tests have passed

A new CLI option: -ginkgo.reportPassed
It will print output for each passed test in the generated report,
including JUnit, Teamcity, and Default reporters.

For example, in JUnit (XML), the test output will be added under:
`<testcase> <passed>`

The default behavior (without this option), prints test output
only if the test case (spec) has failed.

[Fixes #583]

config/config.go

@@ -52,6 +52,7 @@ type DefaultReporterConfigType struct {
 	Succinct          bool
 	Verbose           bool
 	FullTrace         bool
+	ReportPassed      bool
 }
 
 var DefaultReporterConfig = DefaultReporterConfigType{}
@@ -98,6 +99,7 @@ func Flags(flagSet *flag.FlagSet, prefix string, includeParallelFlags bool) {
 	flagSet.BoolVar(&(DefaultReporterConfig.Verbose), prefix+"v", false, "If set, default reporter print out all specs as they begin.")
 	flagSet.BoolVar(&(DefaultReporterConfig.Succinct), prefix+"succinct", false, "If set, default reporter prints out a very succinct report")
 	flagSet.BoolVar(&(DefaultReporterConfig.FullTrace), prefix+"trace", false, "If set, default reporter prints out the full stack trace when a failure occurs")
+	flagSet.BoolVar(&(DefaultReporterConfig.ReportPassed), prefix+"reportPassed", false, "If set, default reporter prints out captured output of passed tests.")
 }
 
 func BuildFlagArgs(prefix string, ginkgo GinkgoConfigType, reporter DefaultReporterConfigType) []string {
@@ -196,5 +198,9 @@ func BuildFlagArgs(prefix string, ginkgo GinkgoConfigType, reporter DefaultRepor
 		result = append(result, fmt.Sprintf("--%strace", prefix))
 	}
 
+	if reporter.ReportPassed {
+		result = append(result, fmt.Sprintf("--%sreportPassed", prefix))
+	}
+
 	return result
 }