U.S. School Districts are jurisdictional not division based

[dmcglone]

The school districts identifiers seemed to be based on what might actually be considered jurisdictions, not divisions.

For example:
ocd-division/country:us/state:al/county:montgomery/school_district:alabama_correctional_facilities
and
ocd- division/country:us/state:az/county:maricopa/school_district:country_gardens_educational_services_llc

Correct me if I'm wrong, but neither of these (and many other examples) seem to have actual geographic boundaries.

For U.S. school districts, it seems a better file to base identifiers on would be the National Center for Education Statistics School District Boundary File which represents actual geographic boundaries.

[jpmckinney]

@ccongchen Those IDs were added in your PRs. Can you respond to @dmcglone?