Unit test for a case described in issue #117 (the changes ware not saved if the model used both paper_trail and globalize3)

This has been already *fixed* in the newest (github) version of globalize3, but maybe that test will be useful. 

For reference: 
This was failing for me on gem 'globalize3'; Works on gem from github. Also this workaround fixes it: 

```ruby
module PaperTrail
  module Model
    module InstanceMethods

      def initialize_copy(source)
        obj = super(source)
        obj.tap { |o| o.send(:remove_instance_variable, :@globalize) } rescue obj
        obj
      end

    end
  end
end
```