**Important note**: This project was completely obsolete because HTML5 Ruby is now available by default on Firefox 38 and later. XHTML Ruby was dead, it was ignored by all browser vendors... Adds XHTML Ruby support. Ruby texts will be rendered above the base texts, as a small text. This supports both simple ruby and complex ruby of W3C spec. Testcases: * http://www.w3.org/International/tests/sec-r