Refactor (There are tests not OK yet)
Merge branch 'develop' of https://github.com/fogbow/fogbow-manager into
develop

Conflicts:
	src/main/java/org/fogbowcloud/manager/core/ManagerController.java
	src/main/java/org/fogbowcloud/manager/xmpp/RequestInstanceHandler.java
	src/test/java/org/fogbowcloud/manager/core/TestManagerController.java