Tiny module to create an SVG element.
Usage

createElement(nodeName, document)
Creates a new SVG element namednodeName
. For example:
``` javascript
var createNode = require('svg-node')
var svg = createNode('svg')
var rect = createNode('rect')
rect.setAttribute('x', 0)
rect.setAttribute('y', 0)
rect.setAttribute('width', 20)
rect.setAttribute('height', 20)
rect.setAttribute('fill', '#f00')
svg.setAttribute('width', 20)
svg.setAttribute('height', 20)
svg.appendChild(rect)
document.body.appendChild(svg)
```
If you're working in a weird environment and need to pass in your
own document
object you can do so using the function's second
argument.