Release 2.3.3

* [14a3cc4](https://github.com/cakedc/migrations/commit/14a3cc4) Bump minimum required CakePHP version to 2.5.4 (refs [#184](https://github.com/CakeDC/migrations/issues/184))
* [f6f3490](https://github.com/cakedc/migrations/commit/f6f3490) CS: Changed doc block "boolean" to "bool"
* [b6c579c](https://github.com/cakedc/migrations/commit/b6c579c) Fixes Schema/app.php issue.
* [749e634](https://github.com/cakedc/migrations/commit/749e634) Improved logic for schema class name detection.
* [9ef51fd](https://github.com/cakedc/migrations/commit/9ef51fd) Adds an option for specifying the Schema class name.