Fine tunned modules scheme.

Adjusted client modules.
Fixed proxy bug in http.

samples/cddb.lua

@@ -1,5 +1,5 @@
 local socket = require("socket")
-local http = require("http")
+local http = require("socket.http")
 
 if not arg or not arg[1] or not arg[2] then
     print("luasocket cddb.lua <category> <disc-id> [<server>]")

samples/lpr.lua

@@ -1,4 +1,4 @@
-local lp = require("lp")
+local lp = require("socket.lp")
 
 local function usage()
   print('\nUsage: lua lptest.lua [filename] [keyword=val...]\n')