Fixed checkbox/radio errors. cferdinandi#31

Make sure polyfill support test runs

fixed cferdinandi#34

Removed second event.preventDefault()

- Added radio group support back to IE9 (switched from querySelectorA…

…ll with CSS3 selector to getElementsByName)

- Added radio group support to validity state polyfill

Fixed validityState polyfill stepMismatch error

Moved pattern match error to the end to make sure other errors are ca…

…ught first

Polyfill updates and bug fixes

Initial release