TinkerforgeBinding support for several new Bricklets, configuration changes, bugfix for polling

Threshold values now have the same unit as the sensor value: __incompatible change__ you have to update your openhab.cfg!

New Bricklets: Bricklet TemperatureIR, Bricklet SoundIntensity, Bricklet Moisture, Bricklet DistanceUS, Bricklet Tilt, Bricklet VoltageCurrent. You can find a preliminary documentation here: https://github.com/theoweiss/openhab/wiki

Bugfix: polled values now are only send once to the event bus.