title: NODE_PATH matches the npm root
body: <p>I get this error when I try scaffolding a project using yeoman with this command.</p>
  
  <pre><code>npm install generator-gulp-webapp --global
  </code></pre>
  
  <p>The error: </p>
  
  <pre><code>Yeoman Doctor
  Running sanity checks on your system
  
  ✖ NODE_PATH matches the npm root
  npm global root value is not in your NODE_PATH
  </code></pre>
  
  <p>I am using Ubuntu 15.04 and have not installed npm and node with the sudo command.</p>