(Accidentally omitted last change from review)

    Added a test to show that all files have 'coding=utf8' on them

    This is a followon to https://rbcommons.com/s/twitter/r/523

    which adds a test to show that all python files under the repo have '# coding=utf8' as the first line

    Testing Done:
    ci.sh passed

    Bugs closed: 227

    Reviewed at https://rbcommons.com/s/twitter/r/524/