multiple elements support (nodeList)

hi matt,
i was wondering, is there a possibility to support the `nodeList` as the params' `element`?

i.e:

``` javascript
css(document.querySelectorAll('.el'), 'width', '200px')
```

otherwise i guess i'll just do a simple `forEach` but it'd be great to be able to pass a `nodeList` or `array` directly. let me know what you think!

Start at the css(...) entry point and inspect how the params' element is handled. Verify behavior with document.querySelectorAll('.el') and an array; done means both can style multiple elements without requiring a caller-side forEach.

Written by the indexing model from the issue text.