[snowy] Add last-sync-revision support to Note model and API handler.

[Sanford Armstrong <sharm src gnome org>]

commit 7a4057d595d73d0f862eecd9990efd8a045ce089
Author: Sandy Armstrong <sanfordarmstrong gmail com>
Date:   Sun May 17 20:47:35 2009 -0700

    Add last-sync-revision support to Note model and API handler.
---
 api/handlers.py |    1 +
 notes/models.py |    2 ++
 2 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/api/handlers.py b/api/handlers.py
index 0346844..372b552 100644
--- a/api/handlers.py
+++ b/api/handlers.py
@@ -143,5 +143,6 @@ def describe_note(note):
         'last-metadata-change-date': local_iso(note.modified),
         'create-date': local_iso(note.created),
         'open-on-startup': note.open_on_startup,
+        'last-sync-revision': note.last_sync_rev,
         'tags': [t.name for t in note.tags.all()],
     }
diff --git a/notes/models.py b/notes/models.py
index 2479f9f..0f5f80d 100644
--- a/notes/models.py
+++ b/notes/models.py
@@ -41,6 +41,8 @@ class Note(models.Model):
                                       default=0)
 
     open_on_startup = models.BooleanField(default=False)
+    
+    last_sync_rev = models.IntegerField(default=-1)
 
     class Meta:
         get_latest_by = 'user_modified'