Fix an issue where user is db fetched twice

- Fix #79
- Rename event EventGet to EventGetUser
- Remove double DB fetch
- Add new event callpoint: After(EventGetUser) for things that need to
  check that the user is ABLE to be gotten after it's fetched from the
  DB. That is before returning to the web app, ensure that the user is
  valid from a confirmation/lock etc point of view.
- Add test to make sure all the events are firing in CurrentUser()

callbacks_test.go

@@ -171,7 +171,7 @@ func TestEventString(t *testing.T) {
 		{EventOAuthFail, "EventOAuthFail"},
 		{EventRecoverStart, "EventRecoverStart"},
 		{EventRecoverEnd, "EventRecoverEnd"},
-		{EventGet, "EventGet"},
+		{EventGetUser, "EventGetUser"},
 		{EventGetUserSession, "EventGetUserSession"},
 		{EventPasswordReset, "EventPasswordReset"},
 	}