Merge branch 'hotfix/20131231-aoj-solved-checker'
Merge branch 'release/20140104'
Fix jekyll-tweet-tag
Add jekyll-youtube
Edit scss/post
Add post
Set language
Merge branch 'hotfix/20140108-arch-linux'
Merge branch 'hotfix/20140108-arch-linux' into develop
Edit header
Merge branch 'hotfix/20140108-ga' into develop