Follow-up: Added support for positioning dropdowns relative-to-parent

A follow-up to https://github.com/claviska/jquery-dropdown/pull/17#issuecomment-18873919

I updated the jsfiddles.
Current Build: http://jsfiddle.net/plapier/VW94U/
My Changes: http://jsfiddle.net/plapier/d859h/