mirage integration

[jmmccasland]

We should build a simple Mirage emulation layer that allows existing Mirage users to easily swap in jsonapi-ts.

For example, inside your mirage config you can define API handlers like this:

this.get('/authors', function(schema, request) {

});

Which could be serviced by a AuthorsProcessor and the callback could be a shorthand for overriding the get method on it.