Updates schema to 1.0 (#374)

- Updates to official name Census.
- Updates `census["census_info"]["summary"]` to reflect official name in the column `label`:
   - From `"cell_census_build_date"` to `"census_build_date"`.
   - From `"cell_census_schema_version"` to `"census_schema_version"`.
- Adds the following row to `census["census_info"]["summary"]`:
   -`"dataset_schema_version"`