Merge pull request akka#15057 from akka/wip-revert-sbt-0.13.2-patriknw

=pro Revert sbt 0.13.2, problem with stamped versions

Author: patriknw

project/AkkaBuild.scala

@@ -756,7 +756,6 @@ object AkkaBuild extends Build {
     scalacOptions in Compile ++= Seq("-encoding", "UTF-8", "-target:jvm-1.6", "-deprecation", "-feature", "-unchecked", "-Xlog-reflective-calls", "-Xlint"),
     javacOptions in compile ++= Seq("-encoding", "UTF-8", "-source", "1.6", "-target", "1.6", "-Xlint:unchecked", "-Xlint:deprecation"),
     javacOptions in doc ++= Seq("-encoding", "UTF-8", "-source", "1.6"),
-    incOptions := incOptions.value.withNameHashing(true),
 
     crossVersion := CrossVersion.binary,
 

project/build.properties

@@ -1 +1 @@
-sbt.version=0.13.2
+sbt.version=0.13.1