title: Visual Studio Code doesn't recognize TypeScript module from `node_modules`
body: <p>Cloned the <a href="https://github.com/palantir/tslint" rel="nofollow"><code>tslint</code> repository</a>, did <code>npm install</code> and <code>grunt</code>, as told in the README, and opened the folder in Visual Studio Code (0.9.1).  Looking at any <code>.ts</code> file - <code>src/rules/typedefRule.ts</code>, say - gives TypeScript errors on <code>require "typescript"</code>: <code>Cannot find module 'typescript'.</code></p>
  
  <p>The <code>typescript</code> module is in the <code>node_modules</code> folder, but VSC doesn't seem to know about that.  How do I tell it to?</p>