mongoid/moped — pull request #152 by ctrochalakis (2013-02-14 15:07:03+00:00)
Title: Capture command errors when sent to slave nodes

If we send a command, like drop, to a secondary node we get this
document as a response:

{"errmsg"=>"not master", "ok"=>0.0}

We should treat that operation error as a `ReplicaSetReconfigured`
error.