Add: schema itemprop values.
Add: schema itemprop values.

1. Add: schema Author.
2. Add: schema Publisher.
3. Change: schema dateCreated - remove invalid "content" value from "time" (Attribute content not allowed on element time at this point.).
4. Add: schema datePublished to dateCreated.
5. Add: schema dateModified.
mchsinx/hexo-theme-next