Implicit boxing operator from T to Maybe<T>

[radiosterne]

I've added implicit boxing operator to Maybe for following reasons:

1. It allows simple collection creation with initializers —

var maybesList = new List<Maybe<int>>
            {
                1,
                2,
                3
            };

instead of

var maybesList = new List<Maybe<int>>
            {
                1.ToMaybe(),
                2.ToMaybe(,
                3.ToMaybe(
            };

2. possible fix of bad R# hadling of Maybe (don't tested)

But then again, any implicit boxing is evil and possibly performance-striking, so do you have any thoughts on necessity of this feature? E.g. Scala Option type doesn't have implicit boxing out-of-the-box.

[radiosterne]

Victory!