v2.0
Focus
Added focus support so that the checkboxes and radios can gain "focus" when the checkradios checkboses and radios are clicked or focused upon.
A .focus class will also be added to the checkradios checkbox and radio containers so that css can be applied on focus. A default css focus style for focused checkboxes and radios has been added.
Tabbing
Added Tab key support so that checkboxes and radios can be cycled through using the tab key to mimic regular checkbox and radio tabbing behavior in supported browsers.
Other keyboard support
The up/down arrow keys will now cycle through radio buttons.
Space bar and enter/return keys will also check and uncheck checkboxes when focused upon.
Bootstrap
Bootstrap support has been added to fix positioning of check marks in Twitter bootstrap.