update JSON-Schema-Test-Suite to dev version that has Draft v4 tests

Currently failing 5 of 255 tests.
pre-register the JSON Schema meta schema

Passes a test in the test suite that assumes that schema is available. Could also pass by using an HTTP loader, but it seems like the meta schema should be present in the environment anyway.
multipleOf now works with small numbers

Passes v4 test multipleOf.js/"by small number".
blacklist tests for "format": "regex", which is a v3 feature removed from v4

Now passes all remaining tests.