Is Beeper Python3 compatible?

[paulocheque]

Thanks in advance

[soasme]

Although Python3 is not included in original purpose, I think it's good to have Beeper Python3 compatible. I will work on this in a new branch.

[paulocheque]

I make some tests here:

• we should remove the u'strings' from the conf.py file
• add python 3.4 (at least) in travis.yml file
• Fix the test below

    def test_stat():
        run_beeper('build', '--version 1')
        output = run_beeper('stat', '--version 1', capture=True)
>       assert output.splitlines()[-1] == 'test-1.tgz'
E       assert "b'[command]:...\ntest-1.tgz'" == 'test-1.tgz'
E         - b'[command]: cd dist; ls  test-1.tgz\ntest-1.tgz'
E         + test-1.tgz