Allow the_title_attribute() to accept a post ID

[coffee2code]

the_title_attribute() does not currently accept being passed a post object/ID and therefore, via its call to get_the_title() without an argument, always assumes the current post. By simply allowing its $args array to accept and use a "post" value, then the function can be used to generate an attribute-friendly post title for any specified post.

Attached is the patch enabling this. The $args array is amended with a "post" element, default of 0 (which maintains current default behavior). Since get_post(), by way of get_the_title(), accepts a post ID or post object, either type can be assigned as value for the "post" element.

Patch mentioned in ticket.

Refresh patch to apply cleanly against trunk.