add Python 3 support and make it standard, re #54
in Python 2 only br' ' works, not rb' '
sys.stdout.buffer only in Python3 -> try
bytes is already in Python 2.6
Merge branch 'master' into py3

to fetch the current README
update README for py3 support
update setup.py
decode isrcs given by backend

Not done for cdrdao, because the file is opened as UTF-8,
per default.
Merge branch 'py3'

See pull request #54