Updated sbt-package-dist plugin version to 1.1.1

Hello, Thanks so much for your work on BlueScale!  It looks really interesting.  I had a minor issue compiling it with sbt caused by a version of the sbt-package-dist plugin.  I've created this super simple pull request that updates the required version of sbt-package-dist to 1.1.1 so it will now compile with sbtVersion=0.12, scalaVersion=2.9.2.  Feel free to pull it in if you think useful, but no worries if you want to ignore this one. Thanks again.