BgFix on ZigbeeManager and Green@Home
Rxtx Property
Added a parameter in order to set the number of minutes for
KeepAliveThread for the ExecutorManager
Merge branch 'master' of https://github.com/marcoNieddu/jemma

Conflicts:
	jemma.osgi.ah.greenathome/src/main/java/org/energy_home/jemma/ah/internal/greenathome/GreenathomeAppliance.java
	jemma.osgi.ah.zigbee/src/main/java/org/energy_home/jemma/ah/internal/zigbee/ZigBeeDeviceImpl.java
	jemma.osgi.ah.zigbee/src/main/java/org/energy_home/jemma/ah/internal/zigbee/ZigBeeManagerImpl.java