Using WP test post (Markup: HTML Tags and Formatting) updated html tag styling

Improved the default styling for headers (changed the font-sizes)
Added default styling for blockquotes
Added default styling for tables including a little bit of JS to add the even
class to every other row
Changed menu.js to functions.js as it isn't just menu script now
Added default styling for pre blocks
Tidied up main.css and wordpress.css

Removed duplicate WordPress generated classes from main.css
Added style definitions for WordPress gallery items
Made normalize.css a local file
Merge branch 'html-tags' into v3.0.0b1