feature: button with icon and text: align icon

[alexbyk]

Hi. I'm expecting this to be aligned:
<button md-button><md-icon>date_range</md-icon> select a date</button>

But instead I got this:

Could you pls add a feature to align icons and text in buttons without external styling?

[fxck]

There's an issue and open PR for this already #1565

[jelbourn]

Dupe of #1565

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