added the ability to send an object of parameters to a lazy load

Now you can call lazy loaded views with
`view "viewName" model_name="TestModel" fetch_params="{json.stringified_object}"`

Pretty straight-forward. most of this PR is adding tests to fetchLazy.
that doesn't work - `fetchLazy` doesn't return the spec so you have to intercept what's being sent to `this.app.fetch` which is what this doing.