prepare for Unified Object Identifier(UOI)
Merge remote-tracking branch 'origin/master'

Conflicts:
	src/main/java/com/bluesky/visualprogramming/core/Message.java
	src/main/java/com/bluesky/visualprogramming/messageEngine/PostService.java
	src/main/java/com/bluesky/visualprogramming/vm/VirtualMachine.java