title: NPM Warns "No Repository Field" but I don't have a repository
body: <p>I'm using node.js at home without a repository, just mucking around. But when I run <strong>npm install</strong>, I get the <strong>No Repository Field</strong> warning as discussed in this <a href="https://stackoverflow.com/questions/16827858/npm-warn-package-json">other question thread</a>.</p>
  
  <p>npmjs.org describes <a href="https://www.npmjs.org/doc/json.html#repository" rel="nofollow noreferrer">this new package.json field</a> with two examples assuming my repository is in either git or svn, but mine is in neither. I'm not using a repository just yet. What values can I use?</p>
  
  <p>I tried empty strings, null values, and even leaving the Repository object empty. </p>