inherit buildOptions in extended factories

[sienic]

Probably the solution to: https://github.com/simonexmachina/factory-girl/issues/134

• Given a parentFactory defined with buildOptions with its respective callbacks.
• Given a childFactory that extends that parentFactory.
• Whenever a models is built out of the aforementioned childFactory,
• the callbacks defined in the parentFactory are not being called.

const parentFactory = FactoryGirl.define('parent', Model, initializer, buildOptions);
const childFactory = FactoryGirl.extend('parent', 'child');

// whenever we build a childFactory, i.e.
await FactoryGirl.build('child');
// the `afterBuild`, and `afterCreate` callbacks set in parentFactory are not being called

This PR tries to solve this.