title: Getting Beyond Compare to Diff 2 Branches Simultaneously
body: <p><code>&gt;&gt;git difftool branch1 branch2</code> opens my difftool (Beyond Compare:BC) with every file that has a diff between the branches. 
  I have to close BC after each file just for it to reopen with the next file.</p>
  
  <p>BC can diff whole directories and multiple files.</p>
  
  <p>Is there a way to get <code>git difftool</code> to open all files simultaneously, or diff the whole tree simultaneously?</p>