Add created_at and requires_pvops_kernel to Linode Image model.

lib/fog/linode/models/compute/image.rb

@@ -8,6 +8,8 @@ module Fog
         attribute :name
         attribute :bits
         attribute :image_size
+        attribute :created_at, types: 'time'
+        attribute :requires_pvops_kernel
       end
     end
   end

lib/fog/linode/models/compute/images.rb

@@ -25,7 +25,8 @@ module Fog
         def map_image(image)
           image = image.each_with_object({}) { |(k, v), h| h[k.downcase.to_sym] = v  }
           image.merge!(:id => image[:distributionid], :name => image[:label], :image_size => image[:minimagesize],
-                       :kernel_id => image[:requirespvopskernel], :bits => ((image[:is64bit] == 1) ? 64 : 32 ))
+                       :requires_pvops_kernel => image[:requirespvopskernel], :bits => ((image[:is64bit] == 1) ? 64 : 32 ),
+                       :created_at => image[:create_dt])
         end
       end
     end