extendable, fully compliant JSON schema validator for NodeJS

 JSV is a JavaScript implementation of a extendable, fully compliant JSON schema
 validator.
 Its features are: with the following features:
  - complete implementation of all current JSON Schema draft revisions;
  - support for creating individual environments (sandboxes) that validate using
    a particular schema specification;
  - provides an intuitive API for creating new validating schema attributes, or
    whole new custom schema schemas;
  - supports `self`, `full` and `describedby` hyper links;
  - validates itself, and is bootstrapped from the JSON schema schemas;
  - works in all ECMAScript 3 environments, including all web browsers and
    Node.js.