Add basic 404 page
Add wp_nav_menu inside nav tags
Remove test code
Add dynamic sidebar
Add styles to make builtin custom header images responsive
Add HTML5 Shiv and script to enable better UX to the admin customiser screen
Add basic 404 loop
Add page-content id to section tag
Add blog-content id to section tag
Add theme support for navigation menus, a sidebar, post thumbnails, post formats, custom background, and background image. Add customiser script and HTML5 Shiv script enqueue. Improve namespacing of functions.