Built in filter modifier on ModelRequest

[Dashron]

Should be kind of like preload, where it adds a modifier, but provides a simpler interface for a common task.
This one should take a function which is called once for each model, and if true is returned it will be in the final ready array.

user_request = UserModel.getAll();

user_request.filter(function (model) {
    return model.name === "Aaron";
});

user_request.ready(function (models) {
    // these will all be named aaron
});

[Dashron]

models moved into their own project