Option to set dropdown options position.

[lasseitorp]

As it is now, the absolute positioning of the dropdown/autocomplete options default to top:100%; bottom:auto and if there's not enough room below but there is above, it switches to top: auto; bottom: 100%;. This can of course be overriden by an !important class, but a "nice to have" could be a auto | above | below option to make things easier.