ADD::: Disconnect.java => Invalidate a session
MODIFY::: Add graphs
	  Add profile in market view
	modified:   LilleWebMarket/WEB-INF/classes/dao/DAOUtil.java
	modified:   LilleWebMarket/WEB-INF/classes/dao/MarketDAO.java
	modified:   LilleWebMarket/WEB-INF/classes/dao/MarketDAOImpl.java
	modified:   LilleWebMarket/WEB-INF/classes/servlet/BuyServlet.java
	new file:   LilleWebMarket/WEB-INF/classes/servlet/Disconnect.java
	modified:   LilleWebMarket/WEB-INF/classes/servlet/MarketServlet.java
	modified:   LilleWebMarket/market.jsp