When using subdirs to reflect categories, the underlying `categories` attribute was not set
Fix link to Jekyll v1.0.0 release post.

What are timezones.
gcnovus and bahuvrihi no longer exist on GitHub.
Actually print properly.
Do not forget to downcase the categories here as well
Merge pull request #2633 from redox/read_categories_from_path
Update history to reflect merge of #2633 [ci skip]