Removed obsolete class references

__init__.py

@@ -6,5 +6,5 @@ from frame import Frame, ControlFrame, OPCODE_CONTINUATION, OPCODE_TEXT, \
         CLOSE_INVALID_DATA, CLOSE_POLICY, CLOSE_MESSAGE_TOOBIG, \
         CLOSE_MISSING_EXTENSIONS, CLOSE_UNABLE
 from connection import Connection
-from message import Message, TextMessage, BinaryMessage, JSONMessage
+from message import Message, TextMessage, BinaryMessage
 from errors import SocketClosed

message.py

@@ -3,7 +3,7 @@ import json
 from frame import Frame, OPCODE_TEXT, OPCODE_BINARY
 
 
-__all__ = ['Message', 'TextMessage', 'BinaryMessage', 'JSONMessage']
+__all__ = ['Message', 'TextMessage', 'BinaryMessage']
 
 
 class Message(object):