customize jekyll default settings.
rewrite about.md for opu-yokotalab.com.
create a welcome post.
revive social accounts info in footer.html.
set more configs of jekyll.
Merge branch 'feature/create_own_about' into develop
Merge branch 'feature/revive_social_account_info_on_footer' into develop
Merge branch 'feature/welcome_post' into develop
Merge branch 'release/20140821_release_01'