title: Travis CI throws status code 403 when using DefinitelyTyped/tsd
body: <p>When Building a project with <em>Travis CI</em> one of my install commands (defined in the <code>.travis.yml</code> abort due to status code 403:</p>
  
  <pre><code>tsd reinstall
  -&gt; running reinstall
  -&gt; an error occured!
  unexpected status code: 403 on: https://api.github.com/repos/borisyankov/DefinitelyTyped/branches/master
  Error: unexpected status code: 403 on: https://api.github.com/repos/borisyankov/DefinitelyTyped/branches/master
      at Request.&lt;anonymous&gt; (/home/travis/.nvm/versions/node/v0.12.4/lib/node_modules/tsd/build/http/CacheStreamLoader.js:158:28)
      at Request.emit (events.js:107:17)
      at Request.onRequestResponse (/home/travis/.nvm/versions/node/v0.12.4/lib/node_modules/tsd/node_modules/request/request.js:1156:10)
      at ClientRequest.emit (events.js:107:17)
      at HTTPParser.parserOnIncomingClient [as onIncoming] (_http_client.js:426:21)
      at HTTPParser.parserOnHeadersComplete (_http_common.js:111:23)
      at TLSSocket.socketOnData (_http_client.js:317:20)
      at TLSSocket.emit (events.js:107:17)
      at readableAddChunk (_stream_readable.js:163:16)
      at TLSSocket.Readable.push (_stream_readable.js:126:10)
  [...]
  The command "tsd reinstall" failed and exited with 1 during .
  </code></pre>
  
  <p>When calling the <a href="https://api.github.com/repos/borisyankov/DefinitelyTyped/branches/master" rel="nofollow">github api url</a> from my local machine, I get a normal response. So it must be something between travis and github api.</p>