Wip/scala 2.11 upgrade

First attempt to move us on to the Scala 2.11 wonderland.

* uses Scala 2.11.**1** - are we the first project to do that? :-)
* based on master, i.e. incorporates the Play 2.3 platform
* comments out all related Inspect code until it is ready for Scala 2.11/Play 2.3/Akka 2.3
* fixes some deprecation warnings but not all as these should be resolved in separate tickets (bigger tasks)
* uses some "unofficial" versions of sbt-rc and template-cache (i.e. published git versions)
* all tests pass but it will need more love wrt offline dependencies...