Blocks App updates

Added new DB table - block_group_members - for group assignments and
block ordering. Added jQuery UI sortable feature for ordering blocks
assigned to a group. Added Delete Block feature. Added API updates to
support new group assignment management. Removed group id field in
block_instances table. Other small changes.
Blocks App updates
Javascript Handler Library updates

Fixed lack of 'body' support for script positioning in the HTML body
Vision theme update
Added jQuery UI Support

Now included in the Common app, possibly to be moved to a standalone app
later with jQuery