In many places we were checking for identity which was the shorthand for
checking if the resource had been saved by the service.
The #persisted? method was added to show a clearer intent and also offer
minimal ActiveModel interface
Should facilitate the following:
require 'fog/aws'
require 'fog/compute'
require 'fog/aws/compute'
I think once you `require 'rubygems'` those should work.
further cleanup should reduce common requires (ie nokogiri)