MdDialogRef does not capture a type for the close result

[eagle-dan1349]

Bug, feature request, or proposal:

Proposal

What is the expected behavior?

Stronger typed MdDialogRef<T, U> class with something like close(dialogResult?: U) method. Or may be close method should accept some sort of template class like MdDialogResult or something.

What is the current behavior?

MdDialogRef's close() method accepts argument of type any.

What are the steps to reproduce?

N/a

What is the use-case or motivation for changing an existing behavior?

Follow TypeScript way

Which versions of Angular, Material, OS, browsers are affected?

Any

[jelbourn]

This was added in #8766

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