Merge branch 'feature/Ship_fit_detail_improvements', implements and closes #14.

Link to ship fit details from contract search pages.
Ship fit detail page changed to an ajax request with a loading message. Implements and closes #4.
Added notes property to ship fit entity and map.
Set the default ship fit notes to an empty string.
Service layer method to validate and update a ship fit in the repository.
Additional validation layer checks for ship fits.
Ajax-only account controller method to retrieve current ship fit values and return as json.
Controller method to update a ship fit via the service layer and return any validation errors.
Display notes on the ship fit detail page if they exist.
Added settings option to ship fit account admin page.