title: exclude subdirectories in tsconfig.json
body: <p>I have installed TypeScript 1.8.2, and using Visual Studio 2015. I have a simple project where I have problems excluding folders from the tsconfig.json file. The problem is I would like to exclude the file typings/browser.d.ts and the folder typings/browser. But this is not the case?</p>
  
  <p>I have no problems excluding a subfolder, but not a sub-subfolder?</p>
  
  <p>[NOTE]
  I just realized the problem is only when I build from Visual Studio! If i build with tsc from the command line, there's no problem. Could I have another version of TypeScript in Visual Studio? How can I check this?</p>
  
  <p>This is my tsconfig.json:</p>
  
  <pre><code>{
    "compilerOptions": {
      "target": "es5",
      "module": "commonjs",
      "moduleResolution": "node",
      "sourceMap": true,
      "emitDecoratorMetadata": true,
      "experimentalDecorators": true,
      "removeComments": false,
      "noImplicitAny": false
    },
    "exclude": [
      "node_modules",
      "public",
      "typings/browser",
      "typings/browser.d.ts"
    ]
  }
  </code></pre>
  
  <p>I have a bigger project, where I use jspm and need to exclude the jspm package folder, which is located as a subfolder to public. </p>