title: Monkeyrunner activity
body: <p>I have one problem, I has started 2 activities via <code>monkeyrunner</code>.<br>
  How I can close one of them?<br>
  I try to used <code>device.stopActivity(package/activity)</code>, but monkeyrunner have not these command.<br>
  And also i want to recieve all working activities how i can do that?</p>