simplify the method of using provider

[ockan]

Now,to realize the provider,3 steps needed:

1\declare the injectable service:

2\give it as a argument of AppFactory:

3\use really the provider:

that is complex.why need to use the decorator '@injectable'? why need to register provider to AppFactory?it is confused.

[eadwinCode]

@ockan @Injectable is used to define the lifetime scope of the provider object. If you don't use @Injectable, and you register the service on the AppFactory or Module the application will assume the provider as a singleton scope. Also, providers in AppFactory or `Module' are registered in the Ellar DI container making them available for injection.

But @ockan, if you feel there are other ways this could be made easy, please share, I would love to hear your suggestion.