Issue #495 - Infragistics styles

I've ported the styles for CheckBox and RadioButton from Brian Lagunas for issue #495.

I have not overwritten the current CheckBox or RadioButton styles, but created new styles, InfragisticsCheckBox and InfragisticsRadioButton. I have also not done anything for the validation style, so currently they will not have the validation tooltip that the existing control styles do.

![checkbox](https://f.cloud.github.com/assets/4315787/907087/df5043b4-fd0a-11e2-9139-049941cf005a.png)
![checkbox-dark](https://f.cloud.github.com/assets/4315787/907088/ed0ab656-fd0a-11e2-97bf-c519872e1307.png)