ref current spec, add its new test case

the updated spec [1] didn't change anything that would make a new version of
python-json-patch necessary. This commit only updates the reference to the
current version, and adds a new example

[1] http://tools.ietf.org/html/draft-ietf-appsawg-json-patch-03

jsonpatch.py

@@ -31,7 +31,7 @@
 #
 
 """Apply JSON-Patches according to
-http://tools.ietf.org/html/draft-pbryan-json-patch-04"""
+http://tools.ietf.org/html/draft-ietf-appsawg-json-patch-03"""
 
 # Will be parsed by setup.py to determine package metadata
 __author__ = 'Stefan Kögl <stefan@skoegl.net>'

tests.py

@@ -133,6 +133,16 @@ class MakePatchTestCase(unittest.TestCase):
         res = patch.apply(src)
         self.assertEqual(res, dst)
 
+    def test_add_nested(self):
+        # see http://tools.ietf.org/html/draft-ietf-appsawg-json-patch-03#appendix-A.10
+        src = {"foo": "bar"}
+        patch_obj = [ { "add": "/child", "value": { "grandchild": { } } } ]
+        res = jsonpatch.apply_patch(src, patch_obj)
+        expected = { "foo": "bar",
+                      "child": { "grandchild": { } }
+                   }
+        self.assertEqual(expected, res)
+
 def suite():
     suite = unittest.TestSuite()
     suite.addTest(doctest.DocTestSuite(jsonpatch))