port to python 3.5

[rpuntaie]

Hello nvie. I've ported this little vim plugin to python 3.5 enabled VIM. It still should work with VIM with Python 2.7 as well, but I haven't tried. It would be great if you could take over these changes.

[wdoekes]

@rpuntaie, at the risk of having duplicating your work, I've also ported it to py3 only:
https://github.com/ossobv/vim-rst-tables-py3

[timcera]

Any hope to get this moving forward?

[rpuntaie]

@wdoekes, I've just seen, you've added support for |replacements|. I'll use, yours then.

[rpuntaie]

@wdoekes, I will integrate #26 and create a pypi package.