* Refactor blocks so that they have a separate id vs css_id. This way
we can have a unique identifier for each visual block.
* Store blocks with a random id as their unique identifier
* Add Admin_Dashboard::remove_block() and modify
themes/admin_default/views/block.html.php to call it when you click the
remove box.
1) drop unnecessary semicolon
2) start with <?php for extra security in the case that the server itself doesn't
have short_tags enabled (the app won't work, but we need to make sure that we're
still secure)
