Not sending metrics if developer build (#168)
Not sending metrics if developer build (#168)

closes #165
mozilla-magnet/magnet-client,arcturus/magnet-client,wilsonpage/magnet-client,mozilla-magnet/magnet-client,wilsonpage/magnet-client,wilsonpage/magnet-client,wilsonpage/magnet-client,wilsonpage/magnet-client,arcturus/magnet-client,mozilla-magnet/magnet-client,arcturus/magnet-client,mozilla-magnet/magnet-client,arcturus/magnet-client,mozilla-magnet/magnet-client,arcturus/magnet-client,mozilla-magnet/magnet-client,wilsonpage/magnet-client,arcturus/magnet-client