Make sure that the images are reloaded when the application is upgraded.

git-svn-id: http://svn.code.sf.net/p/itop/code/trunk@3786 a333f486-631f-4898-b8df-5754b55c2be0

portal/portal.css

@@ -46,7 +46,7 @@ div#portal #banner {
 }
 
 div#portal #logo {
-	background: url(./images/company_logo.png) 0 50% no-repeat;
+	background: url(./images/company_logo.png?v=2) 0 50% no-repeat;
 	margin-top:6px;
 	margin-bottom:6px;
 	margin-left:20px;