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.
My _config.yml
(jekyll-bootstrap configs are omitted):
# 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