Upgrade to sbt 1.0
An issue in sbt 0.13.5 prevented us to crosscompile some libs aggregated
in a root project (See: sbt/sbt#1448)
This issue has been fixed in sbt 1.0 (See: sbt/sbt#3698)
Also explicitely set scalaVersion and crossScalaVersions on every project
Upgrade to sbt 1.0 An issue in sbt 0.13.5 prevented us to crosscompile some libs aggregated in a root project (See: sbt/sbt#1448) This issue has been fixed in sbt 1.0 (See: sbt/sbt#3698)
Also explicitely set scalaVersion and crossScalaVersions on every project