ReadableNativeMap cannot be cast to java.lang.string

[andrew-schenk]

Crashes on Android when using source={{uri: ...}}

Image.getSize(this.props.source.uri, (width, height) => {

needs to be

let source = this.props.source;
if (typeof(source) !== "string") {
source = this.props.source.uri;
}
Image.getSize(source, (width, height) => {