cleanup flake8 error
Allow patterns compiled with re replacements, like regex
Merge pull request #79 from jpmckinney/pattern

Allow patterns compiled with re replacements, like regex
First ideas on anyOf, oneOf, allOf
first ideas for preprocess_ref
run_jsonschema_test_suite
broken tests for some cases that I ran into
1. help first time users to find json schema test suite download
2. use pytest if available
generate one TestCase for each file to make this test suite usable