Revert "Handlers para vote_up e vote_down."

This reverts commit 9211c81c1ca35476e063587b3ac6569ba6875009.
Revert "vote_down.php"

This reverts commit 664d77425b20b07eaf1da521cab1477a436ac9f3.
Revert "Create vote_up.php"

This reverts commit e4cfd708399a9bf07559452502561e20cea17dd0.