CRM-14931 - Nicer aja handling of statusBounce errors

Using the autoClose property seems nice -- better than the unconditional approach I used. :)

But... Can't one use  $.crmSnippet without $.loadForm? Seems like this.options.crmForm would be undefined or null -- and therefore produce a JS error. (Granted: there aren't many places where statusBounce is used outside a form -- "rgrep statusBounce CRM | grep Page" shows 12. So maybe it's theoretical at this point.)