Code cleanup

__init__.py

@@ -8,4 +8,4 @@ from frame import Frame, ControlFrame, OPCODE_CONTINUATION, OPCODE_TEXT, \
 from connection import Connection
 from message import Message, TextMessage, BinaryMessage
 from errors import SocketClosed, HandshakeError, PingError, SSLError
-from extension import Extension, DeflateFrame, Multiplex
+from extension import Extension, DeflateFrame

server.py

@@ -7,7 +7,6 @@ from ssl import SSLError
 
 from websocket import websocket
 from connection import Connection
-from frame import CLOSE_NORMAL
 from errors import HandshakeError