N予備校パッチ

Change the broadcast screen size, add a screenshot button and more on N予備校. For N予備校 broadcasts: - Set the video size in pixels or as a percentage of the browser window. - Add a fullscreen button. - Take a screenshot with one button. - Improve the display of surveys. - Add links to text URLs. - Add print links to learning material pages. Version 3.1.0 added support for a screenshot shortcut. The source code is available at: https://github.com/akamaya/n-yobi-patch