title: Overwrite everything in master with another branch in git
body: <p>I have a very out of date <code>master</code> branch in a git repository.</p>
  
  <p>All of my work has been done in another branch. </p>
  
  <p>What is the best way to merge the two? </p>
  
  <p>I don't care about anything in <code>master</code>, it is way out of date.</p>