Fix undefined key of parsed route in some cases.
Fix fixture table schema according to migration's schema.
Use `CommonTestFixture` instead of `CakeTestFixture`.
Fix `DetailableBehavior` tests.
Use `CommonTestFixture` for all fixtures instead of `CakeTestFixture`.
Fix missing plugin name from alert's element string.
Fix default values in fixture.
Fix reload of non-static properties (i.e. `Reveal::$parametersMatchers`).
Fix missing but required `user_id` values in fixture.
Fix value in test to make it pass.

The `is_paid` column only accepts `INTEGER` values; when skipping the
state validation using a `STRING`, `PDO` throws an exception.
Bump version to 0.3.
Merge branch 'release/0.3' into develop