5.3.7

* Added mom_onthisday (shortcode and template tag)
* onthisday displays posts from previous years that were published on
the current day (and only during the duration of the current day).
* If none are found, it will display 5 random posts.
* The template function displays 5 recent years from the current
category, tag, or all of the published posts on the blog (depending on
whether it is being viewed on a category archive, a tag archive, or
home/single view.)