fix special attribute name on IE.

This patch should fix https://github.com/Polymer/polymer/issues/332
and https://github.com/Polymer/polymer/issues/372

The list of pissible wrong attributes can be retrieved by following codes: 

        var blacklist = [];
        Object.keys(HTMLElement.prototype).forEach(function (item) {
            try {
                HTMLElement.prototype[item];
            } catch (e) {
                console.log(item + ": " + e.name + ", " + e.message);
                blacklist.push(item);
            }
        });
        blacklist.sort();
        document.write("<h3>blacklist</h3>" + blacklist.join("<br/>"));

Here is a single web page http://jsbin.com/gofay/1