Log Message:
Add a package for py-jsonschema. From DESCR:

jsonschema is an implementation of JSON Schema for Python (supporting
2.6+ including Python 3).

Features:

- Full support for Draft 3 and Draft 4 of the schema.
- Lazy validation that can iteratively report all validation errors.
- Small and extensible
- Programmatic querying of which properties or items failed validation.