Several improvements
Merge remote-tracking branch 'origin/master'

Conflicts:
	IoTPublishShare/resources/dbSchema.sql
	IoTPublishShare/src/com/aalto/protocol/design/iotps/objects/IoTPSSensorObject.java
	IoTPublishShare/src/com/aalto/protocol/design/iotps/start/IoTPSClientStarter.java
	IoTPublishShare/src/com/aalto/protocol/design/iotps/start/IoTPSServerStarter.java
	IoTPublishShare/src/com/aalto/protocol/design/iotps/subscribe/engine/SubscribeEngine.java
	IoTPublishShare/src/com/aalto/protocol/design/iotps/udp/engine/ClientToServerUDPEngine.java