Fixing positioning when element is inside of nested relative parent

Example: parent(style=position:relative)>parent>input.  This is the correct way of using jQuery position anyways.
Merge pull request #61 from AddoSolutions/patch-1

Fixing positioning when element is inside of nested relative parent
Merge branch 'master' of github.com:mugifly/jquery-simple-datetimepicker into 1.8.x
Thanks to: AddoSolutions