try sbt 0.13-M2
try sbt 0.13.0-Beta2
upgrade to sbt 0.13.0-RC1
upgrade to sbt 0.13.0-RC2
upgrade to sbt 0.13.0-RC3
Merge remote-tracking branch 'origin/master' into sbt-0.13

Conflicts:
	project/build.properties
use sbt 0.13 syntax in build
upgrade to sbt 0.13.0-RC4
Merge remote-tracking branch 'origin/master' into sbt-0.13
Merge remote-tracking branch 'origin/master' into sbt-0.13
Merge branch 'master' into sbt-0.13
upgrade to sbt 0.13.0-RC5
ENSIME is now available for sbt 0.13
upgrade to sbt 0.13.0 final
Merge branch 'sbt-0.13'