Creating 2 FiberScheduler with MonitorType.METRICS cause "A metric named runawayFibers already exists"

[Finn Bock]

with code like:

    public static void main(String[] args) {
	    FiberScheduler s1 = new FiberForkJoinScheduler("s1", 4, MonitorType.METRICS, true);
	    FiberScheduler s2 = new FiberForkJoinScheduler("s2", 4, MonitorType.METRICS, true);
    }

I get an exception

Exception in thread "main" java.lang.IllegalArgumentException: A metric named runawayFibers already exists
	at com.codahale.metrics.MetricRegistry.register(MetricRegistry.java:91)
	at co.paralleluniverse.common.monitoring.Metrics.register(Metrics.java:42)
	at co.paralleluniverse.fibers.MetricsFibersMonitor.<init>(MetricsFibersMonitor.java:56)
	at co.paralleluniverse.fibers.FiberScheduler.createFibersMonitor(FiberScheduler.java:50)
	at co.paralleluniverse.fibers.FiberScheduler.<init>(FiberScheduler.java:40)
	at co.paralleluniverse.fibers.FiberForkJoinScheduler.<init>(FiberForkJoinScheduler.java:59)
	at co.paralleluniverse.fibers.FiberForkJoinScheduler.<init>(FiberForkJoinScheduler.java:73)
	at test.FiberTest.main(FiberTest.java:12)

It looks like the runawayFibers metrics is not prefixed with the name of the scheduler like the rest of the metrics.