Mise en place BSON encoding
	modified:   io/BsonEcho.java
	modified:   io/JsonEcho.java
	modified:   servlets/LoginServlet.java
	modified:   servlets/LogoutServlet.java
	modified:   servlets/TransactionServlet.java
	modified:   servlets/UserServlet.java
Merge branch 'master' of https://github.com/steven89/if26_projet