initial work
Add microdata following http://schema.org for Article type
Delete .DS_Store
add _include/head.html to include "semantic.html", move _config_semantic.yml to the project root directory
Update LICENSE
Update README: usage, installation, configuration sections
update proper plugin content: opengraph.html, semantic.html and date.html
Merge tag 'v0.1.0'

v0.1.0 Release