Fix compatebility error between EloquentModelSaveStubTest::save() and Model::save()

PHPUnit was throwing this error:

Strict Standards: Declaration of EloquentModelSaveStub::save() should be compatible with Illuminate\Database\Eloquent\Model::save(array $options = Array) in /Users/Andreas/Sites/laravel/laravel-framework/tests/Database/DatabaseEloquentModelTest.php on line 631

This fixes it.

Signed-off-by: Andreas Heiberg <git@andreas-heiberg.com>
Merge pull request #830 from AndreasHeiberg/EloquentModelSaveStubTest-SaveCompatebilityFix

Fix compatebility error between EloquentModelSaveStubTest::save() and Mo...