Add gdcvault parsing test-case

packages/readabilityjs/test/test-pages/gdcvault/expected-metadata.json

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+{
+  "title": "Parallelizing the Naughty Dog Engine Using Fibers",
+  "byline": null,
+  "dir": null,
+  "excerpt": "This talk is a detailed walkthrough of the game engine modifications needed to make The Last of Us Remastered run at 60 fps on PlayStation 4. Topics covered will include the fiber-based job system Naughty Dog adopted for the game, the overall...",
+  "siteName": null,
+  "siteIcon": "http://fakehost/img/favicon.ico",
+  "previewImage": "https://ubm-twvideo01.s3.amazonaws.com/o1/vault/gdc2015/Images/GDC15_Vault-thumb_v1.png",
+  "publishedDate": null,
+  "language": "English",
+  "readerable": true
+}

packages/readabilityjs/test/test-pages/gdcvault/expected.html

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+<DIV class="page" id="readability-page-1">
+    <div id="bumped">
+        <p> You've been logged out of GDC Vault since the maximum users allowed for this account has been reached. To access Members Only content on GDC Vault, please log out of GDC Vault from the computer which last accessed this account.</p>
+        <p> Click <strong><a href="http://fakehost/demo">here</a></strong> to find out about GDC Vault Membership options for more users.</p>
+        <p>
+            <a id="bumpClose">close</a>
+        </p>
+    </div>
+</DIV>

packages/readabilityjs/test/test-pages/gdcvault/url.txt

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+https://www.gdcvault.com/play/1022186/Parallelizing-the-Naughty-Dog-Engine