title: Is it possible to use CodeRay in github pages?
body: <p>I'm using Jekyll-Bootstrap now. In my local environment, I can enable CodeRay in jekyll's _config.yml and use it in my posts without any problem. But the same code cannot work on github.</p>
  
  <p>My <code>_config.yml</code> (jekyll-bootstrap configs are omitted):</p>
  
  <pre><code># Use kramdown as markdown parser engine.
  markdown:      kramdown
  markdown_ext:  markdown,mkd,mkdn,md
  textile_ext:   textile
  
  kramdown:
    auto_ids: true
    footnote_nr: 1
    entity_output: as_char
    toc_levels: 1..6
    smart_quotes: lsquo,rsquo,ldquo,rdquo
    use_coderay: true
  
    coderay:
      coderay_wrap: div
      coderay_line_numbers: nil
      coderay_tab_width: 4
      coderay_bold_every: 10
      coderay_css: class
  </code></pre>