No implementation of md-prevent-menu-close in material2

[adarowiec]

Bug, feature request, or proposal:

Feature request: migrate/implement attribute md-prevent-menu-close from AngularJS to material2.

What is the expected behavior?

When user uses md-prevent-menu-close attribute, after choosing an item - menu should not close.

What is the current behavior?

There is no md-prevent-menu-close and when user clicks menu items, the menu disappears; event.stopPropagation() or event.preventDefault do not work.

[ocarreterom]

See #4842

[crisbeto]

Won't be done due to accessibility concerns. See #4842 (comment).

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