Implement find_or_create_by

Here's a patch. I'm sorry I don't know how to make it a "real patch"

# vendor/plugins/globalize2/lib/globalize/model/active_record/translated.rb
# Around line 48
        module ClassMethods
          def method_missing(method, *args)
            if method.to_s =~ /^find_by_(\w+)$/ && globalize_options[:translated_attributes].include?($1.to_sym)
              find(:first, :joins => :globalize_translations,
                   :conditions => [i18n_attr($1)+" = ? AND "+i18n_attr('locale')+" IN (?)",
                                   args.first,I18n.fallbacks[I18n.locale].map{|tag| tag.to_s}])
            elsif method.to_s =~ /^find_or_create_by_(\w+)$/ && globalize_options[:translated_attributes].include?($1.to_sym)
              found = find(:first, :joins => :globalize_translations,
                   :conditions => [i18n_attr($1)+" = ? AND "+i18n_attr('locale')+" IN (?)",
                                   args.first,I18n.fallbacks[I18n.locale].map{|tag| tag.to_s}])
               if !found
                 found = create($1.to_sym => args.first)
               end
               found
            else
              super
            end
          end