This phinx release introduced changes in the naming scheme the migration files / the migration classes should follow, breaking the tests.

 This commit also removes the ``update()`` call after the ``dropForeignKey()`` calls : it was not necessary.

…ry fix to the SQLite adapter to prevent it from dropping tables when using dropForeignKey

Also change implementation on code tested using the Migrations class (which used to use the Phinx adapter and not the Cake one, leading to unexpected results when the Cake one is used)