Add XML renderer

lib/rabl-rails/renderers/xml.rb

@@ -0,0 +1,13 @@
+module RablRails
+  module Renderers
+    class XML < Base
+    	DEFAULT_OPTIONS = { dasherize: true, skip_types: false }
+
+      def format_output(hash)
+      	# hash = hash[options[:root_name]] if options[:root_name]
+      	xml_options = { root: options[:root_name] }.merge!(DEFAULT_OPTIONS)
+				hash.to_xml(xml_options)
+      end
+    end
+  end
+end