new release merge

release includes
* several bugfixes 
* a more modular setup including an example implementation for the SPI. The example SPI implementation (comprising SPI implementation and Web application) accesses timeseries data stored within a `series` database model (which is used by the [52°North SOS](https://wiki.52north.org/bin/view/SensorWeb/SensorObservationServiceIVDocumentation#Changed_Observation_database_mod))
* a new timeseries formatter for the [flotchart JS API](http://www.flotcharts.org/). This API is being used by the new [52°North JS Timeseries Client](http://sensorweb.demo.52north.org/jsClient-0.2.0/#map) (get the most recent version from https://github.com/52North/js-sensorweb-client)
* some inner refactorings on configuration stuff