update html5 book review post (see msg)

add image for "pro html5 programming" book post to the site: map it to post page. fix broken 'Dive Into HTML5" link.
update jquery t-shirt review post (see msg)

add image for "jquery t-shirt" post to the site: map it to post page. add 'jquery' page tag, fix broken "buy the shirt" link & edit a small bit of text.