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Add beforeGenerate and afterGenerate hooks

This update adds two new hook methods to `HelixSpec`: `beforeGenerate`
and `afterGenerate`.

These hooks allow you easily to adjust the shape/fixture data of
your specs, which can be handy for create alternate specs.

**Example: `afterGenerate()`**

```js
const Dinosaur = createSpec({
  id: faker.random.number(),
  name: faker.name.firstName(),
  location: faker.address.country()
})

Dinosaur.afterGenerate(data => {
  const { name } = data
  return {
    name,
    location: 'Mexico',
    status: 'Happy',
    email: 'noop@superprivacy.com'
  }
})

Dinosaur.generate()
// {
//   name: 'Alice',
//   location: 'Mexico'
//   status: 'Happy',
//   email: 'noop@superprivacy.com'
// }
```

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