Form input name='nodeName' breaks onSubmit event handling

It happened that I stumbled on following edge case. If you add `name='nodeName'` attribute to form's _input_, at some point of React event handling (`ChangeEventPlugin.js: shouldUseChangeEvent()`) it will call: `elem.nodeName && elem.nodeName.toLowerCase()`, but coincidentally `nodeName` property refers to _input_ and invocation fails.

Here's a [jsFiddle example](https://jsfiddle.net/tLd7xvwc/)
