* Bump cpp-driver to 2.0.1
* Create new SensorId header/source that takes over the logic
  previously found in SensorDataStore related to populating
  SensorId structs from MQTT topic strings and serializing
  them into Byte Arrays to be used as Cassandra Row Keys.

* Bumped Cassandra to 2.1.5
* Bumped cpp-driver to 2.0
* Eliminated cassandraBackend in favor of DCDBConnection

In the future, a DCDBConnection handles the low-level connection
to Cassandra. On top of an established DCDBConnection, you can
create a SensorDataStore object which gives you access to raw
sensor readings.

Use the -r option to get raw values instead.

just erronously owerwitten the Makefile in the previous commit. This is the last one edited by Axel.

The tools currently use the new CQL API for Cassandra (while DCDBLib is still using Thrift). It is intended to move DCDBLib ober to the new API so that many of the functions of the two tools will actually be handled via DCDBLib calls.

Application is only a "hello world" dummy a.t.m.

(-> implement support for zipped distfiles and clean up Makefile further)