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


I agreed with you about accessibility, but don't you think that the check mark is doing this role? So if the :focus' state toggles between some similar colors (the check marks' color, that actually is a border) in a pulse movement? In this way, IMO, we'll have the same result and we'll create a more interactive and attractive UI.
![pulse](https://cloud.githubusercontent.com/assets/1520006/3781690/31f3f592-1999-11e4-9537-3458d5b46bac.gif)