Bump versions after release of Scala 2.11.0-RC4

Based on:

   https://scala-webapps.epfl.ch/jenkins/view/scala-release-2.11.x/job/scala-release-2.11.x/52/artifact/scala/versions.properties

With a manual edit of the new property, scala.full.version, which
was not written out by `ant -Dupdate.versions`. That has since
been remedied.
Bump Akka version to 2.3.2

Quoth @rkuhn:

> seeing that you are cutting a Scala release, we’ll need to
> decide on which Akka version to bundle with it. 2.3.0 has
> some remoting bugs which we’d like to leave behind

Given the difficult of overriding the bundled Akka version
from the Scala script runner (SI-8472), we've deemed it
worthwhile to bump the Akka version before releasing 2.11.0.
Merge pull request #3676 from retronym/release/bump-versions-2.11.0-RC4

Bump versions after release of Scala 2.11.0-RC4