Add sample to get exception from continueAsNew run

[longquanzheng]

Stack Trace:
com.uber.cadence.client.WorkflowFailureException: WorkflowType="GreetingWorkflow::getGreeting", WorkflowID="64c080b5-f8a6-4739-b2c5-28ec54413a3b", RunID="c5684578-9fc6-4ff5-9413-4bbd5905d6a0, WorkflowType="GreetingWorkflow::getGreeting", WorkflowExecution="WorkflowExecution(workflowId:64c080b5-f8a6-4739-b2c5-28ec54413a3b, runId:c5684578-9fc6-4ff5-9413-4bbd5905d6a0)"
	at com.uber.cadence.internal.sync.WorkflowStubImpl.mapToWorkflowFailureException(WorkflowStubImpl.java:391)
	at com.uber.cadence.internal.sync.WorkflowStubImpl.getResult(WorkflowStubImpl.java:319)
	at com.uber.cadence.internal.sync.WorkflowStubImpl.getResult(WorkflowStubImpl.java:287)
	at com.uber.cadence.internal.sync.WorkflowInvocationHandler$SyncWorkflowInvocationHandler.startWorkflow(WorkflowInvocationHandler.java:289)
	at com.uber.cadence.internal.sync.WorkflowInvocationHandler$SyncWorkflowInvocationHandler.invoke(WorkflowInvocationHandler.java:248)
	at com.uber.cadence.internal.sync.WorkflowInvocationHandler.invoke(WorkflowInvocationHandler.java:164)
	at com.sun.proxy.$Proxy2.getGreeting(Unknown Source)
	at com.uber.cadence.samples.hello.HelloContinueAsNewException.main(HelloContinueAsNewException.java:91)
Caused by: java.lang.RuntimeException: World
	at com.uber.cadence.samples.hello.HelloContinueAsNewException$GreetingWorkflowImpl.getGreeting(HelloContinueAsNewException.java:64)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method:0)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.uber.cadence.internal.sync.POJOWorkflowImplementationFactory$POJOWorkflowImplementation.execute(POJOWorkflowImplementationFactory.java:246)
	at com.uber.cadence.internal.sync.WorkflowRunnable.run(WorkflowRunnable.java:47)
	at com.uber.cadence.internal.sync.CancellationScopeImpl.run(CancellationScopeImpl.java:102)
	at com.uber.cadence.internal.sync.WorkflowThreadImpl$RunnableWrapper.run(WorkflowThreadImpl.java:99)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)