Add support in Posts to read page.date as a alternative to relative_source_path to extract year/month/day information.
Add support in Posts to read page.date as a alternative to relative_source_path to extract year/month/day information.

e.g. files named:

2011-01-01-name.xx

are handled the same as

name.xx
  ---
  date: 2011-01-01
  ---

awestruct/awestruct,awestruct/awestruct,LightGuard/awestruct,LightGuard/awestruct,awestruct/awestruct,LightGuard/awestruct