Add category feature to the core.

Updated robots.txt + new htaccess files.

I made the following changes for the robots.txt and .htaccess files.

# robots.txt updated
- Allow theme assets (CSS, JS, Images, Fonts) for SEO
- Allow folder with uploaded images (/content/images)

# .httaccess files added
- /content - Deny all
- /content/images - Allow only jpg|png|gif
- /cache - Deny all
- /system - Deny all
- /system/admin/editor - Allow all
- /system/resources - Allow all
- /themes - Deny all
- /themes/blog/css - Allow all
- /themes/blog/fonts - Allow all
- /themes/blog/images - Allow all
- /themes/blog/js - Allow all
- /themes/clean/css - Allow all
- /themes/default/css  - Allow all
- /themes\default\img - Allow all
- /themes\logs\css - Allow all

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.

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.

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

Make HTMLy more flexibel.

Move the more link to template directly so we can modify the text
without changing any functions.

Improving the default theme.

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.

Fi & Vid

FI & Vid

-better Google PageSpeed Ranking

HTMLy fully supports the HTTPS protocol.

Prepare for releasing v1.6

Dynamic heading for themer, there is is_index function.

Improve comments

Add Facebook comments as comment system options.

Fix markup for profile page.

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

Improve theme

Clean up the codes.

Add dynamic menu class. Toolbar should has global style, added
toolbar.css.

Ups wrong markup for static page.

Improve the teaser

User role support

Add option to limit rss length.

Various improvements

Cleaning up the codes.

Improve the style

Forgot the cursor

Improve admin style

Adjust admin style

Fix typos

Improve the admin integration