Added microformats2 h-entry and h-card classnames

Added [microformats2](http://microformats.org/wiki/microformats2) classnames into the existing markup structure to make post content machine readable and discoverable. microformats2 makes HTML content as easy to consume as JSON APIs without forcing people to publish data multiple times (DRY violation e.g. ATOM), making things such as cross-site [commenting](http://indiewebcamp.com/comments) easy to build.

Vocabs:

* http://microformats.org/wiki/h-entry for posts
* http://microformats.org/wiki/h-card for author information