Add js-files for ordering in HairdresserAdmin
Add HairdresserAdmin

For drag and drop-ordering of hairdressers.
Add list_postition field for sorting and override 'save()'

In the hairdresser admin, a drag and drop functionality
is available for reordering. The save-function sets the
list_position-fields of the objects when saving.
Change the 'order_by' property for hairdressers