upd autocomplete template placeholder optional

[Ariesly]

use md-input-container with autocomplete float label

Contact Chips
<md-contact-chips ...>

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[googlebot]

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).

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[googlebot]

CLAs look good, thanks!

[googlebot]

CLAs look good, thanks!

[ThomasBurleson]

There is not an issue associated with this PR nor any unit tests to verify the fix.
Closing as an invalid PR.