Universal matchMedia() polyfill

Pretty much exactly the same as original matchMedia polyfill, but with the addition for a check of the existance of window and document so the polyfill can be used in an Universal (isomorphic) environment.

test whether a CSS media type or media query applies

* Original Authors: Scott Jehl, Paul Irish, Nicholas Zakas
* Spec: dev.w3.org/csswg/cssom-view/#dom-window-matchmedia
* Native support: Chrome since m10, Firefox since 6, and Safari since 5.1

$3

Paul Hayes tackled this using CSS transitions and their transitionEnd event

His code: https://github.com/fofr/matchMedia.js -- though currently it doesnt support IE6-9, since they dont have transitions, obviously. :)

Usage

#### test 'tv' media type
if (matchMedia('tv').matches) {
// tv media type supported
}

$3

if (matchMedia('only screen and (max-width: 480px)').matches) {
// smartphone/iphone... maybe run some small-screen related dom scripting?
}

#### test landscape orientation
if (matchMedia('all and (orientation:landscape)').matches) {
// probably tablet in widescreen view
}

Used in:

* Respond.js
* FormFactor
* Modernizr