Upgraded Markdown engine to MarkdownSharp to support lists.
Added YouTube support to MarkdownSharp.
Increased session timeout to 7 days.
Interface tidy.
Tidied 0-question lesson completion.
Fixed completion revisiting display.
UI tweaks.
Tweaked styles, including ng-cloak preset.
Polish of completion logic.
Added scrolling on marking.
Header fixes.
Tidied navigation.
Added auto-scroll-to-top when visiting a new page.
Fixed course completions not working.
Tidy.
Added scroll-to-top when saving.
Markdown help button.
Removed min-width.
Moved to CDN interface.
Fixed code analysis and code contract issues.
Added filtering of lessons.
Added sitemap and robots.txt support.