requirements.txt for virtualenv

 $ virtualenv icecast-proxy/
 $ cd icecast-proxy
 $ source bin/activate
 $ pip install -r requirements.txt
 $ python setup build_ext --inplace
remove pylibshout since now we use virtualenv
ORM mapping for multiple db engines support

NOTE: table 'users' got a slighlty modified schema,
using 'password' instead of 'pass', that is a
reserved python word