Can add tags on node handler imperatively.

ccnode/node.py

@@ -35,6 +35,12 @@ class DefaultHandler(RpcHandler):
         """
         return get_tags(self, tags, noresolve_tags)
 
+    def set_tag(self, tag):
+        self.tags[tag.name] = tag
+
+    def remove_tag(self, tag_name):
+        self.tags.pop(tag_name, None)
+
 
 class Node(Thread):
     """Main class for ccnode."""