title: Node throwing an error on ansi module
body: <p>I'm looking to check out Mike Bostock's <a href="https://github.com/mbostock/us-rivers">Rivers</a>, but I'm running into an error with Node.js. <code>npm install</code> gives me:</p>
  
  <pre><code>module.js:340
      throw err;
            ^
  Error: Cannot find module 'ansi'
      at Function.Module._resolveFilename (module.js:338:15)
      at Function.Module._load (module.js:280:25)
      at Module.require (module.js:364:17)
      at require (module.js:380:17)
      at Object.&lt;anonymous&gt; (/usr/local/Cellar/node/0.10.0/lib/node_modules/npm/node_modules/npmlog/log.js:5:12)
      at Module._compile (module.js:456:26)
      at Object.Module._extensions..js (module.js:474:10)
      at Module.load (module.js:356:32)
      at Function.Module._load (module.js:312:12)
      at Module.require (module.js:364:17)
  </code></pre>
  
  <p>Any pointers? Or, any previous questions I missed that might point to a solution?</p>