Lots of AJAX Improvements

+ Enhanced all the jQuery AJAX handlers to leverage
window.history.replaceState to update the browser URL when pulling a new
page of posts/comments/replies.
+ Got quotes working for both comments and forum replies
+ Improved AJAX pagination links to more consistently generate the
correct (and clean) paged URL.
+ Some structural changes to the home page posts loop, I put the posts
inside a #posts container to make a lot of the jQuery easier.