fix(menu): add [matMenuTriggerFor] selector and matMenuTriggerFor input

[natsid]

Need this so that MdMenuTrigger can be used with the NoConflictStyleCompatibilityMode module (which allows and requires the 'mat' prefix for all selectors).

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[natsid]

I signed it!

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On Tue, Jan 31, 2017 at 3:50 PM googlebot ***@***.***> wrote: Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA). 📝 *Please visit https://cla.developers.google.com/ <https://cla.developers.google.com/> to sign.* Once you've signed, please reply here (e.g. I signed it!) and we'll verify. Thanks. ------------------------------ - If you've already signed a CLA, it's possible we don't have your GitHub username or you're using a different email address. Check your existing CLA data <https://cla.developers.google.com/clas> and verify that your email is set on your git commits <https://help.github.com/articles/setting-your-email-in-git/>. - If you signed the CLA as a corporation, please let us know the company's name. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#2878 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AFd31sgxiY2m2gFa41K6QOEp1ebUL0rlks5rX8jggaJpZM4LzUyL> .

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[natsid]

I signed it! (I needed to update my emails).

[andrewseguin]

Will be part of the PR #2923 - thanks for the change

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