v4 - .c-select on background inherits white

v4 - .c-select on background inherits white

This:
```
<div class="bg-info">
	<select class="c-select">
		<option selected>Open this select menu</option>
		<option value="1">One</option>
		<option value="2">Two</option>
		<option value="3">Three</option>
	</select>
</div>
```
render this:
http://s.zalog.ro/2015-10-14-19-45-11.png