* 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.
sidebar.html.php file loops over $theme->blocks() which in turn calls
carousel::block() which uses the Block object to create a standard
block UI. Hooray!