Adds placeholder support for mobile devices using a single instance of jQuery Chosen.

jquery-chosen-mobile-placeholder-support.js

	chosen_browser_is_supported = function() {
	  if (window.navigator.appName === "Microsoft Internet Explorer") {
		return document.documentMode >= 8;
	  }
	  if (/iP(od|hone)/i.test(window.navigator.userAgent)) {
		return false;
	  }
	  if (/Android/i.test(window.navigator.userAgent)) {
		if (/Mobile/i.test(window.navigator.userAgent)) {
		  return false;
		}
	  }
	  return true;
	};
	if ( !chosen_browser_is_supported() ) {
		 $('.chosen-select option:first').html($('.chosen-select').data('placeholder'));
	}