separate network layer from synchronizer

lib/network.py

@@ -654,6 +654,13 @@ class Network(util.DaemonThread):
             # Response is now in canonical form
             self.process_response(interface, response, callbacks)
 
+    def subscribe_to_addresses(self, addresses, callback):
+        msgs = [('blockchain.address.subscribe', [x]) for x in addresses]
+        self.send(msgs, callback)
+
+    def request_address_history(self, address, callback):
+        self.send([('blockchain.address.get_history', [address])], callback)
+
     def send(self, messages, callback):
         '''Messages is a list of (method, params) tuples'''
         messages = list(messages)