Better info on how to install missing library

Author: wrichert

ch06/install.py

@@ -41,11 +41,11 @@
 importtwitter
 exceptImportError:
 print("""\
-You need to install python-twitter.
-On Linux:
- sudo pip install python-twitter
-On Windows:
- Follow instructions at http://code.google.com/p/python-twitter/ """)
+You need to install python-twitter:
+ pip install python-twitter
+If pip is not found you might have to install it using easy_install.
+If it does not work on your system, you might want to follow instructions 
+at http://code.google.com/p/python-twitter/ """)
 
 sys.exit(1)