Implement DAO unsetAttribute
Coerce embedded model types
Implemented embedsOne
Validate embedded models by default
Fix test cases
Implement DAO unsetAttribute
Coerce embedded model types
Implemented embedsOne
Validate embedded models by default
Fix test cases
Merge branch 'master' into fabien-feature/embeds-one
Fix the embedsOne test cases
Merge branch 'fabien-feature/embeds-one'
Save the instance even the callback is not present