Process front matter in posts and pages middleware.
Process front matter in posts and pages middleware.

Instead of processing the front matter in the markdown middleware do that
in the posts and pages middleware. Also the markdown middleware is looping
again over posts and pages objects. It's not optimal, but this will stay
for now in the case another middleware needs to be placed between them.

If not then its functionality might be replaced in posts/pages middleware.

yousifh/Pylon,yousifh/Pylon