mongoid/mongoid — pull request #3351 by arthurnn (2013-10-26 22:48:34+00:00)
Title: Remove IdentityMap for good

Remove IdentityMap :heart:

@durran Would like your review on this before I merge it. thanks

![anchorman-teamjump](https://f.cloud.github.com/assets/833383/1414544/a6dc0604-3e90-11e3-90a2-7c7cba5878cb.gif)