Rails core - Jan 2014 - Objects are compared by id, may be comparing by primary_key is more general

As described in http://apidock.com/rails/v3.2.13/ActiveResource/Base/%3D%3D, 
objects are compared by classes and ids. For one of my models I use 
old_entity_hash as primary key. So I must check equality of two objects 
manually. I think that using their primary key as field to compare objects 
is better. I've implemented this in project and it works great. Before 
opening pull request i'd better ask your opinions.

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