title: Bang aliases don't work
body: <p>I tried to add some bang aliases (say... !git stash pop). But those does not work. </p>
  
  <pre><code>[alias]
      pop = !git stash pop
  </code></pre>
  
  <p>This unfortunatelly does not work (please ignore the fact I can use it without the bang - I needed a command to test it. My alias is more complex). </p>
  
  <pre><code>$ git pop
  fatal: 'stash' appears to be a git command, but we were not
  able to execute it. Maybe git-stash is broken?
  </code></pre>
  
  <p>It works withouth the bang</p>
  
  <pre><code>[alias]
      pop = stash pop
  </code></pre>
  
  <p>As expected</p>
  
  <pre><code>$ git pop
  No stash found.
  </code></pre>
  
  <p>Any ideas? </p>