posts now serialize their created_at time

app/models/post.rb

@@ -14,6 +14,7 @@ class Post
   xml_accessor :_id
   xml_accessor :person, :as => Person
   xml_reader   :public
+  xml_reader :created_at
 
   key :public   , Boolean, :default => false
 

spec/lib/exporter_spec.rb

@@ -39,6 +39,11 @@ describe Diaspora::Exporter do
     doc.xpath('//posts').to_s.should include status_message1.id.to_s
   end
 
+  it 'should include post created at time' do
+    doc = Nokogiri::XML::parse(exported)
+    doc.xpath('//posts').to_s.should include status_message1.created_at.to_s
+  end
+
   it 'should include a list of users posts' do 
     doc = Nokogiri::XML::parse(exported)
     posts = doc.xpath('//posts').to_s