title: Closing selenium grid instances
body: <p>There seems to be a lack of documentation about this (or at least I can't find it).  I want to eventually have a load of Selenium tests running on Jenkins and using a Selenium Grid2.  When I am writing my tests I would like to know how I tell the hub that I have finished with the <code>WebDriver</code> instance I am using.  Should I call <code>webDriver.close()</code> or <code>webDriver.quit()</code>?  What happens when I ask for a <code>RemoteWebDriver</code> and none are available, is there a timeout period that I can set?</p>
  
  <p>Or can anyone point me to some documentation/blog about this, everything I've found tells you how to get stuff up and running but stops there?</p>