mat-action-list buttons do not have ripple

[fxck]

https://stackblitz.com/edit/angular-material2-issue-7rmz17

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

latest

[devversion]

I've shortly looked into it. Looks like the <mat-action-list> is technically only supposed to contain list items with buttons.

We should either restrict this by not allowing normal list elements without a button, or just make it also work for list items without a button. I'd go with the latter, and just support ripples like for the nav-list.

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