Added __iter__ function Song.py
Added __iter__ function Song.py

Added an iterator function to song.py to enable
easy iteration through song attributes.

Signed-off-by: Mathew Bramson <21950d8c5d5fd96ad6c6568ab752cbe88d93b390@gmail.com>

cloud-shadow/pyitunes,gerpsh/pyitunes,liamks/pyitunes,liamks/libpytunes