Use explicit parameters instead of request format to determine whether we render a remote or non-remote form in aspects#new.
Facebox needs to get back a text/html response. We were using text/javascript to indicate that we wanted a remote form and text/html to indicate we wanted a non-remote form. The trouble is, if we request with text/javascript then that is the format we get back. It doesn't really make sense to use formats that way anyway, so I changed it to an explicit parameter. This had the nice side effect of simplifying our new-aspect views.