Allow for omitting date on post
Allow for omitting date on post

Previously, all posts had to show a date. If the `date:` attribute was removed from the md file, then something like "0000 Jan 01" would default. 

This is use for static pages that are not part of the blog structure, like a separate "about" or "contact" page.
MSF-Jarvis/msf-jarvis.github.io