sbt/sbt — pull request #1288 by jsuereth (2014-04-25 12:58:04+00:00)
Title: Add a warning if the build scala version is evicted for another.

* Add new ConflictReport helper to build to display only conflict information
* Add hook to issue warnings if the scalaVersion isn't the one resolved
* Update documentation to reflect these changes.

Review by @eed3si9n