Include message body in notification emails for convenience.

app/models/notifier.rb

@@ -46,6 +46,7 @@ class Notifier < ActionMailer::Base
     @subject = "[OpenStreetMap] #{@from_user.display_name} sent you a new message"
     @body['to_user'] = @to_user.display_name
     @body['from_user'] = @from_user.display_name
+    @body['body'] = message.body
     @body['subject'] = message.title
     @body['url'] = "http://#{SERVER_URL}/message/read/#{message.id}"
   end

app/views/notifier/message_notification.rhtml

@@ -1,5 +1,9 @@
 Hi <%= @to_user %>,
 
-<%= @from_user %> has sent you a message through OpenStreetMap with the subject "<%= @subject %>". You can read the message at:
+<%= @from_user %> has sent you a message through OpenStreetMap with the subject "<%= @subject %>":
 
-<%= @url %>
+==
+<%= @body %>
+==
+
+You can also read the message at <%= @url %>