Correct bug with association moderation

`TheModerator::Model` is not included in every `ActiveRecord` model so
it has to be included in association models if it is not when moderating
associations.
Add spec for has_many associations
Check for CollectionProxy to detect has_many

Rails 4 returns an `ActiveRecord::Associations::CollectionProxy` instead
of just an `Array` for has_many associations.
Bump version to 0.1.1