chore(Site): Use rawgit's CDN for data files

We were pointing straing to rawgit.com instead of cdn.rawgit.com for our
.json files and it was probably throttling. The newer version of our
custom grunt-ngdocs fixes this.

package.json

@@ -49,7 +49,7 @@
     "karma-script-launcher": "~0.1",
     "grunt-karma": "~0.8",
     "marked": "~0.2",
-    "grunt-ngdocs": "https://github.com/c0bra/grunt-ngdocs/tarball/0.1.7-custom16",
+    "grunt-ngdocs": "https://github.com/c0bra/grunt-ngdocs/tarball/0.1.7-custom19",
     "grunt-conventional-changelog": "~1.0.0",
     "grunt-gh-pages": "~0.9.0",
     "semver": "~2.2.1",