md-spinner: color binding not working

[xgqfrms-GitHub]

it seems that there was no different among of the below codes!

what's wrong with this?

<md-spinner mode="indeterminate"></md-spinner>
<md-spinner mode="determinate"></md-spinner>
<md-spinner color="primary"></md-spinner>
<md-spinner color="accent"></md-spinner>
<md-spinner color="warn"></md-spinner>

https://plnkr.co/edit/U5iKFrTyqaAQttE6i0Xh?p=preview

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