updated setup.py
added bin/ folder
Change location of config- and pidfile

primary use configfile in the root of the active virtualenv, if this fails use default configfile
primary create pidfile in the root of the active virtualenv, if this fails use default pidfile
improve package setup, install worker.py as package script
prepare CHANGELOG for v0.0.3
Bump version 0.0.2 -> 0.0.3