Added declaration of HTML5 support, fixes #8
Add notes mentioning what Microdata and Microformats look like in the code
Omit the old comment form call, since we will always want to use our custom one
Added more explanatory comments and adjusted spacing for more readable and customisable code, fixes #7
Only show comments link in content-single if comments not closed
Changed search results content template to titles only
Tag template now uses content-list instead of generic content template
Moved closing </main> tag to before sidebar, and wrapped sidebar in role=complementary