mdSelect does not inherit theme

[koodzik]

Hi. I have found mdSelect does not inherit theme style.
See here http://plnkr.co/edit/2ZQMFJzij0MmRdLawaRQ?p=preview

It's similar to #1399

[ThomasBurleson]

See comments from #2628:

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Using a md-select in a md-theme section, does not inherit the theme. For example, using a dark theme based on light-green, md-select is using the default theme (blue) instead of the light-green.

See this codepen: http://codepen.io/anon/pen/RPPoZg

The inputs are using the correct theme, however md-select is using the default theme. This is not expected.