function dereference (parser, options) {
debug('Dereferencing $ref pointers in %s', parser.$refs._root$Ref.path);
var dereferenced = crawl(parser.schema, parser.$refs._root$Ref.path, '#', [], parser.$refs, options);
parser.$refs.circular = dereferenced.circular;
parser.schema = dereferenced.value;
}
Crawls the JSON schema, finds all JSON references, and dereferences them.
This method mutates the JSON schema object, replacing JSON references with their resolved value.

@param {$RefParser} parser
@param {$RefParserOptions} options