Drastic API Rollback to d1d460373

* Revert "Included _klass to call '#after_initialize'"

  This reverts commit 109e00b9ebfdd0a986df9fee230dbdc57d92cb8d.

* Revert "Update README and bump version patch"

  This reverts commit 004a41a8ff52418eb891a2b736b8ec735e8b32c1.
Bump patch version to v0.1.3