Update global settings paths to reflect the sbt 0.13 way.

See https://github.com/sbt/sbt/issues/735 or
http://www.scala-sbt.org/0.13.1/docs/Community/ChangeSummary_0.13.0.html.
Merge pull request #6 from leifwickland/updateGlobalForSbt0.13

Update global settings paths to reflect the sbt 0.13 way.