scoverage/sbt-coveralls — pull request #14 by iref (2014-04-11 14:53:03+00:00)
Title: Updated Specifying Your Repo Token

I tested it only with scala 2.10.4 and sbt 0.13, but import with fully qualified name didn't work.
But simple import `import CoverallsPlugin.CoverallsKeys._` works perfectly.

So this should be changed in docs.