Updated code to use jasonmayes checkboxes

Updated checkbox code to use material style checkboxes that work cross browser as seen here:
http://codepen.io/jasonmayes/pen/wxtFr
Currently supports IE9+, Chrome (Mobile + Desktop), Safari, Opera, Firefox


.wskCheckbox.checked is drawing a stroke, actually an outline.

can fix it adding outline:none;
![screen shot 2014-08-01 at 12 46 00](https://cloud.githubusercontent.com/assets/1520006/3781151/24c4e918-1993-11e4-82b0-165ff5796a19.png)