Scopes must be defined in lambdas or procs.

https://github.com/mongoid/mongoid/commit/fb8fbda750b1a036201476f410f867c38d516388
Yep, thats the way to go from now on... BSON is its own gem.

https://github.com/mongoid/moped/issues/215
Removes all attr_accessible and attr_protected calls.
Updates API for Mongoid 4.