Closes #275 (Attach Testbed Runtime gateways to SmartSantander EventBroker to listen device attached/detached Events)
Merge branch 'develop' of github.com:itm/testbed-runtime into develop
Merge branch 'develop' into feature/gateway-plugins

Conflicts resolved:
	iwsn-gateway/src/main/java/de/uniluebeck/itm/tr/iwsn/gateway/DeviceManagerImpl.java
	iwsn-gateway/src/main/java/de/uniluebeck/itm/tr/iwsn/gateway/GatewayConfig.java
	iwsn-gateway/src/main/java/de/uniluebeck/itm/tr/iwsn/gateway/GatewayModule.java