RF: coveralls (not used/relied on really) -> codecov
RF: coveralls (not used/relied on really) -> codecov

codecov in our (datalad, etc) experience provides a better service,
great support, and super-nice intergration with chromium and firefox
for reviewing coverage of pull requests.  In light of the
@with_rw_directory fiasco detected/fixed in #521 I would strongly
recommend to (re-)enable and use coverage reports

gitpython-developers/GitPython,gitpython-developers/gitpython,jeblair/GitPython,nvie/GitPython,gitpython-developers/gitpython,jeblair/GitPython,gitpython-developers/GitPython,breavo/GitPython,breavo/GitPython,nvie/GitPython