Support named optional parameters in @Injectable ctors

[kegluneq]

Right now, named optional parameters do not work in @Injectable ctors, but maybe they should.

• Should a named optional parameter be implicitly annotated as @Optional?

[langley-agm]

+1, I agree, es6/Typescript already handle optional parameters why add a new annotation to do something similar yet not as good and that breaks the existing functionality? I wonder why is it breaking , does Angular DI call the constructor with a null instead of not providing a value at all?

[langley-agm]

Is there any reason for closing this?

[zoechi]

@langley-agm because Dart issues are now maintained in dart-lang/angular2

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