To run :
bundle exec jekyll serve --livereload
and run
/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome \
--new-window "http://127.0.0.1:4000" \
--remote-debugging-port=9222 \
--user-data-dir=/tmp/chrome2/ \
--media-cache-size=1 \
--disk-cache-size=1