Rename Server- and ClientMessage

Renamed ServerMessage and ClientMessage to respectively ResponseMessage
and RequestMessage to make it more clear.

client/command.py

@@ -7,7 +7,7 @@ from client.httpclient import HTTPClient
 from httplib import parser
 from httplib.exceptions import InvalidResponse, InvalidStatusLine, UnsupportedEncoding
 from httplib.httpsocket import FORMAT
-from httplib.message import ClientMessage as Message
+from httplib.message import ResponseMessage as Message
 from httplib.retriever import PreambleRetriever
 
 sockets: Dict[str, HTTPClient] = {}