Added support for nested folders via **kwarg 'scope' in import_configuration.
For Dataloader objects, scope is assumed to be the plural of the component
name (eg, 'environments').

CI-171
Incorporated comment suggestion and added document string.

CI-171
Changed building data_dirs to a private function with list comprehension.

CI-171
Updated order in which root/scope folders are returned from add_scope.

CI-171
Renamed test folders to remove 's' from default naming.

CI-171
Merge branch 'feature/ci171' into develop