Use schema.org microdata schema in posts.

Signed-off-by: Huei-Horng Yo <hiroshiyui@gmail.com>
Update _config.yml

Signed-off-by: Huei-Horng Yo <hiroshiyui@gmail.com>
Merge pull request #9 from hiroshiyui/master

Use schema.org microdata schema in posts.
Merge branch 'master' into production