Exclude `googx/dom/fullscreen.js` from API-docs

This PR (a successor of #1811) suggests to explicitly configure includes and excludes inside of the jsdoc3 configuration file.

This removes the following API-doc-block of `googx/dom/fullscreen.js` which appears on the startpage of the docs:

![api-doc-fullscreen-on-startpage](https://f.cloud.github.com/assets/227934/2345855/46c8472a-a53b-11e3-8ccb-58d2caa14620.png)