Implement hurl method

Works as follow:

```js

var rules = {
  name: 'string'
};

var test = {
    "name": "John Doe",
    "email": "johndoe@gmail.com"
};

anchor(test).hurl(rules, function(err) {
  console.log(err);
});

// [Error: Validation error: Attribute "email" is not in the ruleset.]

```