Patch for superredcloth to enable textile table headers

[why the lucky stiff]

On Mon, Mar 26, 2007 at 02:27:09PM -0400, Stephen Bannasch wrote:
> I updated my patch for table_headers here:
> 
>    http://code.whytheluckystiff.net/redcloth/ticket/9
> 
> I fixed a problem where it was breaking other functionality and and 
> added more table tests.

I finally got around to checking this in.  I don't know why it took
me so long, cause this was a good patch, Stephen.

_why