added Idx model

Author: ryanhertz

lib/spark_api/models.rb

@@ -14,6 +14,7 @@
 require 'spark_api/models/custom_fields'
 require 'spark_api/models/document'
 require 'spark_api/models/fields'
+require 'spark_api/models/idx'
 require 'spark_api/models/idx_link'
 require 'spark_api/models/listing'
 require 'spark_api/models/listing_cart'

lib/spark_api/models/idx.rb

@@ -0,0 +1,11 @@
+module SparkApi
+  module Models
+    class Idx < Base
+
+      extend Finders
+
+      self.element_name = "idx"
+
+    end
+  end
+end