fix the exercice api
Merge branch 'master' of https://github.com/nicolasfavier/GAE-JS-AJAX

Conflicts:
	war/WEB-INF/appengine-generated/datastore-indexes-auto.xml
	war/WEB-INF/appengine-generated/local_db.bin
	war/WEB-INF/classes/servlet/communication/TrainningServlet.class
Merge branch 'master' of https://github.com/nicolasfavier/GAE-JS-AJAX

Conflicts:
	war/WEB-INF/appengine-generated/datastore-indexes-auto.xml
add the expected time