//= require modernizr
File upload support It's useful if you want to hide the upload feature of your app on devices that don't support it (iphone, ipad, etc). Detection is made by testing if the new created upload field is disabled or not. If it's disabled, most likely the browser does not support upload. By Mircea Georgescu
Modernizr.addTest('upload', function(){
var el = document.createElement('input'); el.setAttribute('type', 'file'); return !el.disabled;
});