Python 3 support

[vadmium]

You might be interested in some small changes I made to a version of this package. They are in the /usenet/pynzb/ directory at https://bitbucket.org/vadmium/pyrescene/src/py3/usenet/pynzb/. Unfortunately I don’t think Bitbucket provides a page with a log or diff of a directory, but here is a summary of my changes:

• Fix NZBSegment.set_message_id() method call in “expat_nzb.py”
• Use encoded byte string instead of text in the tests suite
• Handle “basestring” removal from Python 3 in “base.py”
• Use BytesIO rather than StringIO in the Element Tree and “lxml” implementations

The result should work on Python 3 and Python 2 with the same code, although it would drop Python < 2.6 support. Let me know if you would like to me to migrate these changes from Mercurial to Git.

[vadmium]

The above changes were merged into the upstream "Pyrescene" project:

• Set_message_id() fix: https://bitbucket.org/Gfy/pyrescene/commits/995ea86
• Encoded test byte string: https://bitbucket.org/Gfy/pyrescene/diff/usenet/pynzb/tests.py?diff2=6a5acd2
• Handle basestring: https://bitbucket.org/Gfy/pyrescene/diff/usenet/pynzb/base.py?diff2=f81f946
• Use BytesIO: https://bitbucket.org/Gfy/pyrescene/diff/usenet/pynzb/etree_nzb.py?diff2=ffe2d23 and https://bitbucket.org/Gfy/pyrescene/diff/usenet/pynzb/lxml_nzb.py?diff2=ffe2d23

See also PR #4 with the set_message_id() fix.