added function to retrieve the current state

sleekxmpp/xmlstream/statemachine.py

@@ -112,6 +112,13 @@ class StateMachine(object):
 		self.transition(self.__current_state, self._default_state)
 
 
+	def current_state(self):
+		'''
+		Return the current state name.
+		'''
+		return self.__current_state
+
+
 	def __getitem__(self, state):
 		'''
 		Non-blocking, non-synchronized test to determine if we are in the given state.