pilight binding

First version of the pilight binding. [Wiki page describing the binding](https://github.com/idserda/openhab/wiki/pilight-Binding)

Let me know if you require any additional info. 
sending the Thread to sleep shall be avoided since the internalReceiveCommand is called synchronously. Better implement a method "delayedUpdateCall()" which makes use of the concurrent Classes or the Quartz Scheduler