amelioration retour sur /Login & /Logout
	modified:   io/BsonEcho.java
	modified:   io/Echo.java
	modified:   io/JsonEcho.java
	modified:   model/LoginManager.java
	modified:   servlets/LoginServlet.java
	modified:   servlets/LogoutServlet.java
Merge branch 'master' of https://github.com/steven89/if26_projet