Ruby text isn't handled properly

[ElnuDev]

When indexing posts that use the <ruby> tag, for example 漢（かん）字（じ） <ruby>漢<rp>（</rp><rt>かん</rt><rp>）</rp></ruby><ruby>字<rp>（</rp><rt>じ</rt><rp>）</rp></ruby>, the ruby text isn't handled properly. All of the content of <rt> and <rp> should be ignored, as they aren't a part of the actual text content, just annotations. Currently, Stork just expands the <rp> parentheses, so the former becomes 漢（かん）字（じ）. Since words can be broken up across multiple <ruby> tags, this causes 漢（かん）字（じ） to not come up in search results for 漢字.