Can't override td vertical alignment via WYSIWYG editor interface

Similar to the issue http://drupal.org/node/1751362...

By default Omega adds "vertical-alignment: middle;" to the "td" element and Alpha adds "vertical-alignment: baseline" to table, tbody, tfoot, thead, tr, th, td. This makes it impossible for beginners to override the vertical alignment in the WYSIWYG scenario. When using a WYSIWYG the alignment is added via valign="middle" and not through style="vertical-alignment: middle". Therefore the default Omega vertical alignment always overrides the user entered value.

I suggest we remove the vertical alignment on table elements as a default.