Convert EOL style to project Unix LF standard.
Cleanup trailing whitespace.
Add .gitignore to project.
Mostly automated Python 3.3 portability fixes using the 'future' package
and its 'futurize' tool. All tests run by 'test_vobject.py' pass for
Python 3.3 but compatibility with Python 2.6 and 2.7 hasn't been
verified.