use std options={} format for optional parameters

lib/fog/vcloud_director/generators/compute/vapp.rb

@@ -3,13 +3,13 @@ module Fog
     module Compute
       module VcloudDirector
 
-        # @see http://pubs.vmware.com/vcd-51/topic/com.vmware.vcloud.api.reference.doc_51/doc/types/VmType.html
+        # @see http://pubs.vmware.com/vcd-51/topic/com.vmware.vcloud.api.reference.doc_51/doc/types/VAppType.html
         class Vapp
-          attr_reader :name, :description
+          attr_reader :name, :options
 
-          def initialize(name, description=nil)
+          def initialize(name, options={})
             @name = name
-            @description = description
+            @options = options
           end
 
           def generate_xml
@@ -18,7 +18,7 @@ module Fog
               VApp('xmlns' => 'http://www.vmware.com/vcloud/v1.5',
                    'name' => name
                   ) {
-                Description description unless description.nil?
+                Description options[:Description] if options.key?(:Description)
               }
             end.to_xml
           end

lib/fog/vcloud_director/requests/compute/put_vapp_name_and_description.rb

@@ -19,8 +19,8 @@ module Fog
         #
         # @see http://pubs.vmware.com/vcd-55/topic/com.vmware.vcloud.api.reference.doc_55/doc/operations/PUT-VAppNameAndDescription.html
         # @since vCloud API version 0.9
-        def put_vapp_name_and_description(id, name, description=nil)
+        def put_vapp_name_and_description(id, name, options={})
-          body = Fog::Generators::Compute::VcloudDirector::Vapp.new(name, description).generate_xml
+          body = Fog::Generators::Compute::VcloudDirector::Vapp.new(name, options).generate_xml
           request(
             :body    => body,
             :expects => 202,