Google Code-in

We just added Travis CI to our repository, and most of the builds are fine.

However, we seem to have a missing dependency or the path is not ok.

It is your task to figure out how we can fix this (you can experiment with travis in a fork of the repository).

We expect a PR that fixes the Linux builds completely.

You can find a failed build for linux here: https://travis-ci.org/CCExtractor/ccextractor/jobs/312300053