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

scss/_custom-forms.scss

@@ -135,6 +135,7 @@
   padding: .375rem 1.75rem .375rem .75rem;
   padding-right: .75rem \9;
   vertical-align: middle;
+  color: $input-color;
   background: #fff url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAUCAMAAACzvE1FAAAADFBMVEUzMzMzMzMzMzMzMzMKAG/3AAAAA3RSTlMAf4C/aSLHAAAAPElEQVR42q3NMQ4AIAgEQTn//2cLdRKppSGzBYwzVXvznNWs8C58CiussPJj8h6NwgorrKRdTvuV9v16Afn0AYFOB7aYAAAAAElFTkSuQmCC) no-repeat right .75rem center;
   background-image: none \9;
   background-size: 8px 10px;