Mobility

* Fix location of Rails generators to work with plugins
([56](https://github.com/shioyama/mobility/pull/56))

* Partial support for AR 4.2 ([46](https://github.com/shioyama/mobility/pull/46))
* Fix issues with Sequel >= 4.46.0 ([47](https://github.com/shioyama/mobility/pull/47))
* Include anonymous modules instead of defining methods directly on class
([049a5f](https://github.com/shioyama/mobility/commit/049a5f90fd898d82984d2fe1af1646fda48ad142),
[d8fe42](https://github.com/shioyama/mobility/commit/d8fe42f81211640125e6a50bf681d45dbaa71c40),
[9cc3d0](https://github.com/shioyama/mobility/commit/9cc3d0e8c3f813c15213848f305e363c4eec6b8e))

* Fix deprecation warnings when using ActiveRecord 5.1
([44](https://github.com/shioyama/mobility/pull/44))

* Fix STI issues ([43](https://github.com/shioyama/mobility/pull/43))

* Fix deprecation warnings using class_name ([32](https://github.com/shioyama/mobility/pull/32))
* Avoid using respond_to? on relation, to fix ImmutableRelation exception
([d3e974](https://github.com/shioyama/mobility/commit/d3e974855f7e772b5df43f665a2251a1982cfff0)).

* Add support for uniqueness validation ([28](https://github.com/shioyama/mobility/pull/28))
* Inherit translated attributes in subclasses ([30](https://github.com/shioyama/mobility/pull/30))