#200 Added text field for comments to school model and updated unit tests

Had a couple issues with the unit tests. Mainly it was the patch test case for Schools in test_school.py because when I added the field I kept getting a response there that said 'primary name/phone/email' were required to make the patch request, so I updated utils/test.py to have those fields in the TestSchools object to not be empty strings. I also generated a migration with 'python manage.py schemamigration core --auto' but have yet to apply the migration.