Switches to non anonymous callbacks.
Bump to 0.10.1
Updates to mongoid 4.0.0.beta1.
Adds both dependencies mongoid-paranoia and mongoid-versioning.
Mongoid::Callbacks is now Mongoid::Interceptable.
Field _id must be marked as not-versioned.
ActiveModel 4 changes.
Updates both mongoid-paranoia and mongoid-versioning to 1.0.0.beta1.