Update to SBT v0.13.11
Update to SBT v0.13.11

http://www.scala-sbt.org/0.13/docs/sbt-0.13-Tech-Previews.html#sbt+0.13.11
https://groups.google.com/d/msg/sbt-dev/Hs-OF-Vo6m0/SnQDNBCxAQAJ

BanzaiMan/gu-who,guardian/gu-who