Import unmodified sbt.control and sbt.io from sbt commit d509ff83a139b4dd0acb02fe26eb504b5df6231d
Rename sbt package to asbt in our copy-paste code

asbt = activator sbt
Build cut-and-paste sbtio and depend on it instead of real one
Change sbt references to asbt references
Merge pull request #29 from typesafehub/wip/havocp-sbtio

copy-paste sbt IO temporarily so we can sync scala version