added support for outputing a report of the tests in JSON format
added support for outputing a report of the tests in JSON format

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