[MERGE] Use the new authenticate() API instead of login()

Using the new authenticate() API instead allows to pass
a user-agent environment along with the credentials.
The main use for the UA environment at this point is
to pass the base URL used to login, so that the server
may initialize its "web.base.url" global config parameters

bzr revid: odo@openerp.com-20111213161554-jbtrp94aatcnibne

addons/web_rpc/static/src/example.html

@@ -29,7 +29,7 @@
     c._modules_loaded = true; // Hack to prevent loading of additional modules
 
     var s = new c.base.Session(); // setup a Session
-    s.session_login("web-trunk", "admin", "admin", function() {
+    s.login("web-trunk", "admin", "admin", function() {
 
             var ds = new c.base.DataSetSearch(s, "ir.model"); // DataSetSearch used to search, read
             ds.read_slice(['name','model'], {}, function(users){