title: git flow - how to start working on existing feature branch
body: <p>I would like to start working on another developer's feature branch (we use git and git flow).
  AFAIK The branch has been published (pushed). How can I get it to my local repository?</p>
  
  <p>I tried:</p>
  
  <pre><code>git flow feature pull origin/XXXXXX-1003b
  
  fatal: 'origin/XXXXXX-1003b' does not appear to be a git repository
  fatal: The remote end hung up unexpectedly
  Failed to pull from remote 'origin/XXXXXX-1003b'.
  </code></pre>
  
  <p>And:</p>
  
  <pre><code>git flow feature pull XXXXXX-1003b
  
  fatal: 'XXXXXX-1003b' does not appear to be a git repository
  fatal: The remote end hung up unexpectedly
  Failed to pull from remote 'XXXXXX-1003b'.
  </code></pre>
  
  <p>Please advise. Thanks</p>