Revert to newly-revived Typogrify project

Since the Typogrify project will be actively maintained going forward,
there is no need for the fork.
Merge branch 'master' of https://github.com/getpelican/pelican
Fix issue #1258

Correctly handle DEFAULT_DATE = None .
Merge pull request #1262 from utdemir/master

Fix issue #1258
multiple authors implemented
Merge pull request #1247 from paylogic/multiple-authors

Multiple authors implementation for #956
Merge branch 'master' of https://github.com/getpelican/pelican

Conflicts:
	pelican/themes/notmyidea/templates/authors.html