Fix a position bug occurring when deleting elements by updating acts_as_iist
Use acts_as_list ~> 0.3 to achieve maximum compatibility and use < 0.4.0 because of a known issue with the trash

See https://github.com/magiclabs/alchemy_cms/pull/506
Merge remote-tracking branch 'origin/2.9-stable' into 2.9-loading-alchemy-before-first-migration-fix-with-updated-acts_as_list