[TIP] :compiler pytest for Vim

[Whyme Lyu]

Hi list,

As per this message[1] I've implemented `:compiler pytest` for Vim. You 
can get it on vim.org: 
http://www.vim.org/scripts/script.php?script_id=4508 or 
5long/pytest-vim-compiler on Github.

I believe that pytest.vim[1] would be popular already but I'd prefer a 
language-agnostic way to integrate with plugins like MakeGreen or 
Dispatch.vim. So I've gone the :compiler way and made this.

Feedback welcome :)

-whyme

[1]: 
http://lists.idyll.org/pipermail/testing-in-python/2011-January/003790.html
[2]: https://github.com/alfredodeza/pytest.vim