Add some flexibility to ci-upload defaults (#86)
Add some flexibility to ci-upload defaults (#86)

And avoid printing an error about custom-universes.txt being
unavailable in build.sh'es
comptelfwd/dcos-commons,vishnu2kmohan/dcos-commons,mesosphere/dcos-commons,comptelfwd/dcos-commons,mesosphere/dcos-commons,mesosphere/dcos-commons,comptelfwd/dcos-commons,adragomir/dcos-commons,adragomir/dcos-commons,comptelfwd/dcos-commons,adragomir/dcos-commons,adragomir/dcos-commons,mesosphere/dcos-commons,comptelfwd/dcos-commons,vishnu2kmohan/dcos-commons,mesosphere/dcos-commons,tobilg/dcos-commons,vishnu2kmohan/dcos-commons,vishnu2kmohan/dcos-commons,adragomir/dcos-commons,tobilg/dcos-commons,tobilg/dcos-commons,tobilg/dcos-commons,vishnu2kmohan/dcos-commons,comptelfwd/dcos-commons,tobilg/dcos-commons