Hook to allow modules to override badges (patch included)

I needed the ability to allow modules to add/remove badges. Please find attached a small patch that adds a new "hook_user_badges" that modules may implement to modify the user's badges.

Note that this does not use module_invoke_all, as the first argument must be passed by reference. It uses instead the same method used by user_module_invoke">.

Example use by a module:

/* Implementation of hook_user_badges */
function goopackage_user_badges(&$badges, $uid)
{
  if ($uid == 3) {
    $badges[2] = user_badges_get_badge(2);
  }
}