title: Make multiple boot2docker virtual machines
body: <p>I'm using boot2docker as the image for my virtual machine (I'm running Windows 7, 64 bit), but I would like to be able to create another vm with the same image. </p>
  
  <p>If I try <code>New</code> in the VirtualBox application, I have the usual choice of Ubuntu, Windows etc. but not the boot2docker image. Alternatively, if I just use the Boot2Docker shortcut/shell script, it automatically connects to the already existing vm and doesn't give me a choice to make a new one.</p>
  
  <p>So my question is, how do I make another VM using the boot2docker image?</p>