title: what's the difference between ambientDependencies and regular dependecies in typings
body: <p>In the following typings.json file, what the difference between ambientDependencies(or globalDependencies) and regular dependencies:</p>
  
  <pre><code>{
    "ambientDependencies": {
      "es6-shim": "registry:dt/es6-shim#0.31.2+20160317120654",
      "jasmine": "registry:dt/jasmine#2.2.0+20160412134438",
      "jquery": "registry:dt/jquery#1.10.0+20160417213236"
    },
  </code></pre>
  
  <blockquote>
    <p>"dependencies": { }, &lt;--- what does this do?</p>
  </blockquote>
  
  <pre><code>}
  </code></pre>
  
  <p><code>typings install &lt;something&gt; --save</code> will save to dependencies, but what does this mean?</p>