title: 'git diff' doesn't show enough
body: <p>I want to see the difference between the <em>master</em> branch and my feature branch. I have many pulls from the master to my feature branch and want to see the changes that would be added if I merged my feature into the master.</p>
  <p>This is my situation:</p>
  <pre><code>-*--*--*-----*&lt;master&gt;
    \     \     \
     1--*--*--*--2--*&lt;feature&gt;
  </code></pre>
  <p>My problem is <code>git diff master feature</code> seems to only display commit number 2. How can I see the diff that a GitHub pull request would show, which I believe is all the way to commit 1?</p>
  <p>I noticed <code>git cherry</code> shows me the commits I want to see the difference for.</p>