pep8 style

[sobolevn]

Hey! Thanks for your project.

I am using it with no issues, but today I have looked inside. This project needs some good style fixing.
I can send you a PR, if that's okay.

May be you should also consider using pylint? I can also add this check to the .travis.yml.

[Kim Thoenen]

Hey @sobolevn

Sure, PR's are always welcome - feel free to add pylint too!

Best,
Kim

[Kim Thoenen]

closed in #18