Support non-floating placeholder with select

[Faris-AH]

Bug, feature request, or proposal:

Feature request

What is the expected behavior?

<md-select [floatingPlaceholder]:boolean >
<md-option ... >
</md-select>
or
<md-input-container [floatingPlaceholder]:boolean>
<md-select ...>
<md-option ... >
</md-select>
</md-input-container>

What is the current behavior?

not support

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

Input elements can have floating or non-floating placeholder .Select can be use with input elements.
Select should have floating or non-floating placeholder.Similar to

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

Material2 v2.0.0-beta
Angular 2.4.1

[fxck]

Damn, this is like the third issue I was about to open today and try to fix, only to found out it's not only already open but has a PR as well. What is the reason for PRs not being reviewed/merged @crisbeto? Does it have something to do with prior testing on internal google apps? Or is it just that Kara and Jeremy are busy with their own stuff?

[crisbeto]

Well, people are busy and Jeremy is on vacation for a bit.

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