update .travis.yml to check all *.py files and
update .travis.yml to check all *.py files and

expand the list of initially silenced pylint issues.
(issue #838)

moyogo/fontbakery,graphicore/fontbakery,graphicore/fontbakery,moyogo/fontbakery,googlefonts/fontbakery,googlefonts/fontbakery,graphicore/fontbakery,googlefonts/fontbakery,moyogo/fontbakery