title: browserify is installed, but is not available in command line
body: <p>I install Browserify:</p>
  
  <blockquote>
    <p>npm install -g browserify</p>
  </blockquote>
  
  <p>then I try to run it:</p>
  
  <blockquote>
    <p>$ browserify main.js > bundle.js</p>
  </blockquote>
  
  <p>and Windows says</p>
  
  <blockquote>
    <p>'browserify' is not recognized as an internal or external command</p>
  </blockquote>
  
  <p>Why is that? The <a href="https://github.com/substack/node-browserify" rel="noreferrer">Browserify page</a> promises it will work, but it does not.</p>