* Add support for regex pattern testing
* Add tests
* Separate JsonSchemaProxyHandler statics into JsonSchemaValidator
* Use this instead of JsonSchemaValidator
* Make JsonSchemaValidator non-static
* Use cache map for regex
* Add clone function
* Replace utilIsolate with clone
* Replace JsonSchema.isolate with clone function
* Include core.js for tests which use json-schema.js
* Update visisted set