Allow element types as Avatar children

[lwansbrough]

I have a custom icon (an SVG element) I'd like to put in an Avatar. I can do it, but I get an error/warning about prop types.

[mlaursen]

Is there a reason you can't do:

render() {
  const icon = <FontIcon iconClassName={null}><svg ..... /></FontIcon>;
  return <Avatar icon={icon} />;
}

or

render() {
  return <Avatar src={svgPath} alt="Alt describing icon" />;
}

?

I do think that it is still ok to update the PropTypes to allow more than just string for the children prop.

[lwansbrough]

@mlaursen Yup that might also be a solution!