title: Remove old git commits
body: <p>I'm very new to git, and was wondering if something like this is possible?</p>
  
  <pre><code>&gt;git log --pretty=oneline --abbrev-commit
  2f05aba Added new feature
  3371cec Fixed screw up    &lt;-- I want to remove this
  daed25c Screw up          &lt;-- and remove this.
  e2b2a84 First.                So it's like they never happend.
  </code></pre>
  
  <p>Is this possible?</p>