Add tox to check the PEP8 + Fix current code PEP8.

Superseed #156 
It doesn't looks right, also it is tested. Yes parenthesis are another way
to do it.
Le 5 oct. 2014 17:51, "Michael Joseph" <notifications@github.com> a écrit :

> In cookiecutter/generate.py:
>
> > @@ -148,7 +149,7 @@ def ensure_dir_is_templated(dirname):
> >      Ensures that dirname is a templated directory name.
> >      """
> >      if '{{' in dirname and \
> > -        '}}' in dirname:
> > +            '}}' in dirname:
>
> This indent doesn't seem right.
> I'm also [image: :-1:] on \ for line continuation, we should maybe wrap
> it in parens, so we can get implicit continuation?
>
> —
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> <https://github.com/audreyr/cookiecutter/pull/282/files#r18435828>.
>