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[FIX] updated to be compatible with Laravel's Custom Polymorphic Types.

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see: https://laravel.com/docs/5.7/eloquent-relationships#custom-polymorphic-types

#### Summary of the change: - refactored code to be compatible with [Laravel's directory structure](https://laravel.com/docs/8.x/structure) - added translations publishing P.S.: this PR is backward compatible

"frozen" requirements

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A package should not freeze requirements, otherwise there will be problems like bellow. I'll create a PR. 

see Cobliteam/cassandra-migrate#64

This PR basically improves model replication process and allows to users customize behavior fluently. Refer to README for examples. **Note: this PR introduces breaking changes.**