This reverts commit 9fa8fab864.

Before this pull request, the 404 and 404-search templates where handled
as full HTML pages without the page context (layout).

With this pull request both pages are rendered inside the selected
themes layout. Additionally the 404 template now contains the "search
form" and the homepage link.

All Themes are already updated with the above changes.

Adding popular posts widget.

Make HTMLy more flexibel.

Move the title, description, and canonical from the head_contents for
better templating. Eg. for Twitter Card or OG.

Styling, performance tweak, and bugs fixes.

HTMLy fully supports the HTTPS protocol.

Prepare for releasing v1.6

Dynamic heading for themer, there is is_index function.

Add Facebook comments as comment system options.

Add disqus recent comments to the core.

Add new theme and set the default to when first run.