Implemented Context.pop().

pystache/context.py

@@ -139,4 +139,6 @@ class Context(object):
     def push(self, item):
         self._stack.append(item)
 
+    def pop(self):
+        return self._stack.pop()
 

tests/test_context.py

@@ -229,3 +229,16 @@ class ContextTestCase(TestCase):
         context.push({key: "buzz"})
         self.assertEquals(context.get(key), "buzz")
 
+    def test_pop(self):
+        """
+        Test pop().
+
+        """
+        key = "foo"
+        context = Context({key: "bar"}, {key: "buzz"})
+        self.assertEquals(context.get(key), "buzz")
+
+        item = context.pop()
+        self.assertEquals(item, {"foo": "buzz"})
+        self.assertEquals(context.get(key), "bar")
+