Helping fill out JSON requests


@bripkens has a cool suggestion on the API Console’s github issues list:

The idea is to generate valid JSON payload templates given the schema in the RAML, which the user can then fill out when submitting requests. This would be useful for any JavaScript client generator, such as the API Notebook. I believe we’ve talked about the usefulness of this internally, in the context of both projects; @bripkens is willing to contribute it too.

(@bripkens we’re trying to get out a simple contributors agreement so we can take contributions. Thanks!)