Use the parent id as the location for a model.
This greatly reduces the recursive work that must be done
during move operations to keep the location accurate.
Additionally, the locationService now implements a method
`persistLocation` which can be used to persist the current object
location as it's original location.
Fill in specs for CreationService, which supports the
Create action, which, in turn, is included to support
the Create button in Browse mode. Part of the transition
of common user interface elements for WTD-574.
