ajout support JSON en GET + chagement param GET /Transaction + disable GET /User
	modified:   io/BsonEcho.java
	modified:   servlets/LoginServlet.java
	modified:   servlets/LogoutServlet.java
	modified:   servlets/TransactionServlet.java
	modified:   servlets/UserServlet.java
	modified:   utils/ServletUtils.java
	modified:   utils/UserUtils.java
Merge branch 'master' of https://github.com/steven89/if26_projet