added list of dependencies to qr_reader.py

qr_reader/qrreader.py

 #!/usr/bin/env python2
 # -*- coding: utf-8 -*-
 
-import sys, os, re, subprocess, httplib
+import sys, os, re, subprocess, string
 from threading import Timer
-import pygtk, gtk, gobject
-import pygst
-pygst.require("0.10")
+import pygtk, gtk
 import gst
-import zbar, Image, string, urllib
+import zbar, Image
+
+#
+#	required dependencies:
+#		zbar (http://pypi.python.org/pypi/zbar)
+#		Python Imaging Library (http://www.pythonware.com/products/pil/index.htm)
+#		gstreamer python bindings (http://gstreamer.freedesktop.org/modules/gst-python.html)
+#
 
 class GTK_Main: