added Speaker#full_name to the JSON API

app/serializers/speaker_serializer.rb

@@ -1,12 +1,16 @@
 class SpeakerSerializer < ActiveModel::Serializer
   include ActionView::Helpers::TextHelper
 
-  attributes :guid, :name, :company, :biography
+  attributes :guid, :name, :full_name, :company, :biography
 
   def name
     object.public_name
   end
 
+  def full_name
+    [object.first_name, object.last_name].join(" ")
+  end
+
   def biography
     if object.biography.blank?
       nil