Updated project build:
- Updated from Akka 2.3.6 to 2.3.8
- Using sbt assembly 0.12.0 now in combination with sbt 0.13.7 (sbt assembly 0.12.0 depends on sbt 0.13.6+)
- Removed ProjectAssembly.build.scala as a common sbt assembly strategy is not needed anyway.
- renamed all sbt assembly specific build.sbt files to assembly.sbt
- changed the build.properties from 0.13.5 to 0.13.7 (is that valid for the Play Framework?)

Bugfix in NRA:
- CloseableHttpResponse = httpclient.execute(httpPost) is now correctly catching a ConnectException, when the connection could not have been established.

CITMASTER-33 - Finish Integrated Controllers