fix recent regression in Color

missing piece of 78b206d0beec55bbe3c0fed5b9e4e72200962c3f
add Travis CI config on headless branch
Merge branch 'headless' into scala-2.11

Conflicts:
	.travis.yml
tweaks to work with latest ScalaTest
do without -Xfatal-warnings for now on Scala 2.11