Fixes callback time for style tags on all browsers
Fixes callback time for style tags on all browsers

Style tags don't emit the "load" event for IE, but they're loaded synchronoysly, so this diff changes the code that calls the callback function for tihs case to use async.nextTick.

metal/metal-dom,travisc5/metal.js,travisc5/metal.js,mairatma/metal.js