Create NavigationService without implementation
Using Stack of GameView in NavigationService
Implement Navigate method of NavigationService
Implement GoBack of NavigationService. and better use of Stack
Add Dispose method to NavigationService
First version of Navigation Service

Conflicts:
	Tamazombie/.idea/workspace.xml
	Tamazombie/src/com/tamazombie/portableGame/MyLibgdxGame.java