implement iqdb wrapper

app/logical/iqdb/responses/response_200.rb

@@ -0,0 +1,18 @@
+module Iqdb
+  module Responses
+    class Response_200 < Base
+      attr_reader :imgid, :score, :width, :height
+
+      def initialize(response_string)
+        @imgid, @score, @width, @height = response_string.split(/ /)
+        @score = score.to_f
+        @width = width.to_i
+        @height = height.to_i
+      end
+
+      def post_id
+        imgid.to_i(16)
+      end
+    end
+  end
+end