New className API

[CT Wu]

Thanks for this awesome lib. I want to suggest a new className API, by which we can pass down a className to <svg />.

For example:

<MorphReplace className="foo"/>

will generate

<svg className="foo">

I would like to open a PR for this, if the API looks good to you.

[Goran Gajic]

Sure if you find that useful why not