implement iqdb wrapper

app/logical/iqdb/responses/collection.rb

@@ -0,0 +1,27 @@
+module Iqdb
+  module Responses
+    class Collection
+      def initialize(response_string)
+        @responses = response_string.split(/\n/).map do |string|
+          ::Iqdb::Responses.const_get("Response_#{string[0..2]}").new(string[4..-1])
+        end
+      end
+
+      def matches
+        @matches ||= responses.select {|x| x.is_a?(Iqdb::Responses::Response_200) && x.score >= 0.9}
+      end
+
+      def empty?
+        matches.empty?
+      end
+
+      def errored?
+        errors.any?
+      end
+
+      def errors
+        @errors ||= responses.select {|x| x.is_a?(Iqdb::Responses::Error)}.map {|x| x.to_s}
+      end
+    end
+  end
+end