modify postgres archiving and add ceqr school template

[damonmcc]

resolves #370, resolves #371

changes

• modify ingest.py logic when destination in postgres:
  • create a schema for the dataset if it doesn't exist
  • write the data as a table named after the version
  • update the "latest" table to be a view of the new data
• modify related tests files:
  • still use nypl_libraries data in tests but rename it to test_nypl_libraries for clarity and to avoid conflicts
  • update tests to expect new schema/versioned tables postgres approach
  • improve tests to use less hardcoded strings

notes

• intended to replicate approach/results of older cook (archiver.py) with recipes (sca_capacity_projects_current.py)(recipes.csv])
• it seems that the cook + recipes approach was the precursor to data library