Make roundingBorderColor accept attributes
<!-- Rounding border width-->
<attr name="roundingBorderWidth" format="dimension"/>
<!-- Rounding border color -->
- <attr name="roundingBorderColor" format="color"/>
+ <attr name="roundingBorderColor" format="color|reference"/>
<!-- Rounding border padding -->
<attr name="roundingBorderPadding" format="dimension" />
