Rename Server- and ClientMessage

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

client/response_handler.py

@@ -9,7 +9,7 @@ from client.httpclient import HTTPClient
 from httplib import parser
 from httplib.exceptions import InvalidResponse
 from httplib.httpsocket import FORMAT
-from httplib.message import ClientMessage as Message
+from httplib.message import ResponseMessage as Message
 from httplib.retriever import Retriever
 
 BASE_REGEX = re.compile(r"<\s*base[^>]*\shref\s*=\s*['\"]([^\"']+)['\"][^>]*>", re.M | re.I)