regression: md-close-on-select in md-menu should respect router-link properties

[zevdg]

Steps to reproduce

Make an md-menu that uses the "to" property on it's md-menu-items. note that the menu does not close when an item is selected

Which browser?

chrome on 1.0.0-beta8 (this issue was not present in beta7)

What is expected?

the menu should close when selecting an item

What is actually happening?

the menu does not close. this is easy enough to work around by adding a dummy click handler, but since it worked in the previous version, I'm guessing this was an unintended regression and not working as designed

Reproduction Link

https://codepen.io/zevdg/pen/ddGdLg