Load Event.attendance eagerly
Added methods to get events for user, attend and resign to EventService
Renamed parameter for get user in UserService from id to login to make it more clear that it's retrieved by login
Changed hbm2ddl.auto to update so it doesn't drop database contents on redeploy
Added methods to rest interfaces to support login/register users, and attend/resign from events
Added register/login to web app, attend events, and list events for user