If we have two models, one is embedded to another.

We attached validation to parent and embedded ones.

If parent fields are valid, but embedded ones are invalid, `create!` method won't raise exception and create model into DB.

Steps to reproduce.

• boot to any Linux distributive
• install ruby, bundler, mongodb, start mongodb
• unpack attached archive, cd to it
• run `bundler install`
• run `bundler exec ruby ./all_is_well.rb`, see validation error as expected
• run `bundler exec ruby ./doesnt_throw_as_expected.rb`, see no validation error
  •  sorry, I can't setup it to work without Rails, so it shows another exception, but in Rais it just creates model. But if to check it later: `instance.valid?` - it returns false