Disambiguate attributes on ActiveResource errors

I have submitted a patch that fixes an issue with deserializing errors returned from the server for ActiveResource records. The code for deserializing looks for the humanized name in the error messages to determine which errors belong to which attribute. However, when attributes start with the same word (i.e. "name" and "name_source"), the errors can be assigned incorrectly.

https://rails.lighthouseapp.com/projects/8994/tickets/6713