Update sessions/sessiondb/badger to its latest version and SessionController is able to initialize itself if session manager is not provided by the caller-dev.

Changes:

Update the badger database using transactions, as supported from yesterday via: 06242925c2

Add a custom `OnActivate` via mvc/activator/activate_listener.go, this can be used to perform any custom actions when the app registers the supported Controllers. See mvc/session_controller.go for the excellent use case.

errors.Reporter.AddErr returns true if the error is added to the stack, otherwise false


Former-commit-id: c896a2d186a4315643f3c5fdb4325f7ee48a9e0a

_examples/mvc/session-controller/main.go

@@ -23,7 +23,8 @@ func (u *VisitController) Get() {
 	u.Session.Set("visits", visits)
 
 	// write the current, updated visits
-	u.Ctx.Writef("%d visits in %0.1f seconds", visits, time.Now().Sub(u.StartTime).Seconds())
+	u.Ctx.Writef("%d visit from my current session in %0.1f seconds of server's up-time",
+		visits, time.Now().Sub(u.StartTime).Seconds())
 }
 
 func main() {