#6 Added structure for backup master
#6 Added structure for backup master (pt. 2)
#6 Added observer and more backup functionality
#6 more work on backup instance
#6 #9 Finalised backup instance, added boot observer and ssh command
Merge pull request #11

Conflicts:
	code/CCLabCore/src/main/java/com/cclab/core/MasterInstance.java
	code/CCLabCore/src/main/java/com/cclab/core/NodeInstance.java
	code/CCLabCore/src/main/java/com/cclab/core/scheduler/Node.java
	code/CCLabCore/src/main/java/com/cclab/core/scheduler/Scheduler.java