Feature to change Sitemap priorities direct with the "config.ini" for
SEO. Additionally this commit adds the "lastmod" tag for posts.

- Set the Sitemap priorities for subtypes (Base, Post, Static, Tag, ...)
within the config.ini
- Values beween 1.0 and 0.0 or "false" to disable a subtype.
- Default priority is 0.5 as fallback. (see functions.php) The default
for "base" (Homepage) is 1.0.
- Disabled subtypes aren't available in the sitemap.xml (index).
- The sitemap for posts now contains the "lastmod" set the the post's
date.

Make the tag URL always lowercase and accept case insensitive URL e.g
/tag/htmly or /tag/HTMLy.

Cache the widget and refresh it when any content edited or new content
added.

Use htmlspecialchars() for title tag and description tag generation.

Adding popular posts widget.

Add new theme blog

Fix the date and time on the edit content page so it will displayed as
year, month, day, hour, minute, and second.

Add bootstrap menu classes.

strip_tags and preg_replace problematic tags.

Trying to add content type: image, video, audio, link, and quote. No
styling yet.

Make HTMLy more flexibel.

Add post draft feature for the blog post.

Remove empty <p></p> tags.

Add options recent.count to the recent posts list functions so we can
change it using config.ini