Exposed

## Exposes Marionette FormView's Validator Hash

Allows the Marionette FormView's access to it's formValidator object. This makes it easy to inherit rules from parent form views. Just add 

`_.extend(FormView.prototype.formValidator, inheritableRules);`

Where inheritableRules is some hash of rules you wish to be shared.  

For example, in ProjectX we're including in the Marionette Patch the following lines

```javascript
_.extend(Marionette.FormView.prototype.formValidator, {
    encodeable: function(val) {
        try {
            window.btoa(val);
        } catch (e) {
            return false;
        }
        return true;
    }
});
```

This will allow all `Marionette.FormViews` access to the `encodeable` rule. Yes, I know it's a stupid rule... but it's not my fault!
Doesn't this mean that non-functions will just silently pass? Do we want to explicitly handle non-functions and fail loudly?