Code cleanup

__init__.py

@@ -7,5 +7,5 @@ from frame import Frame, ControlFrame, OPCODE_CONTINUATION, OPCODE_TEXT, \
         CLOSE_MISSING_EXTENSIONS, CLOSE_UNABLE
 from connection import Connection
 from message import Message, TextMessage, BinaryMessage
-from errors import SocketClosed
+from errors import SocketClosed, HandshakeError, PingError, SSLError
 from extension import Extension, DeflateFrame

message.py

@@ -1,5 +1,3 @@
-import json
-
 from frame import Frame, OPCODE_TEXT, OPCODE_BINARY