Migration to new Scala/Akka versions.
Removed unneeded torque dependency.
Added a microbenchmark.
Merge branch 'master' into long-triple-pattern
Preliminary: Represent index IDs with a Long.
Finally, all tests pass.

On to benchmarking and cleaning it up, if the results are good.
Almost all pluggable modules optimised for TR.
Adapted to new S/C handler factories.
Using the new specialisation opportunities.
Redundant bulk msg bus for specialisation.
Improved Long decoding performance.
Updated to Scala 2.11.2
Added missing Kryo reg. for spec. bulk signal.
Adapted to separate messages without source ids.
Simplified the signalling of an exh. result iter.
Separate triple mapper for single-machine usage.
Using a simpler signal bulker.
Simplified messaging paths by skipping sourceId.
Improved load balancing heuristic.
Improved load bal. over workers and in storage.