Add create:factory command

[sephyld]

also added --F|factory option to make:model for factory creation

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Implements feature request #1007

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Hello everyone, I'd love a review of this PR. My main concern is that I'm not using a Winter-specific Factory class to inherit from in the factory.stub, but the created Factory inherits directly from the Laravel base factory class.

// Created Factory Class PostFactory.php
//[...]
use Illuminate\Database\Eloquent\Factories\Factory;

class PostFactory extends Factory
//[...]

Unlike the related model, which inherits from the Winter Model class

// Created Model Class Post.php
//[...]
use Winter\Storm\Database\Model;

/**
 * Post Model
 */
class Post extends Model
{

I don't think this is inherently an issue, but in the case it is, I think I'll have to add a Factory base class in the Storm library