feat(autocomplete): add md-autocomplete classes to overlay panel

[crisbeto]

Transfers any classes added to md-autocomplete to the resulting panel, allowing for easier styling similarly to md-menu.

Fixes #4196.

[willshowell]

Related #6618. And would it be possible to support NgClass syntax?

[crisbeto]

I would rather keep it simple and in line with md-menu. It can be added later if people ask for it.

[willshowell]

Ok cool! Also does it support removal of classes? It looks like you can only add classes, though I haven't tested.

[crisbeto]

It doesn't, but the intention here is just to allow styles to be overridden. My worry with making it more dynamic is that people may end up putting it in a state where it interferes with the panel being toggled correctly.

[kara]

LGTM

[andrewseguin]

Merging this in but it includes an md- in the comment, can you send another PR that removes md-autocomplete and changes it to autocomplete or mat-autocomplete?

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