Updating Message in Toast if message prop is updated and updating toast position on screen orientation change

[chitrangsinghvi]

• updating message in toast if message prop passed is updated.
• animation on closing toast externally
• support for screen orientation

[zhuyifan2013]

@chitrangsinghvi there is no need to be so complicated , just do this :
change the

style={[ styles.defaultStyle, position]}

to

style={[ styles.defaultStyle, position , {width: Dimensions.get('window').width}]}

and delete the width prop in styles.defaultStyle

[dudash]

Any idea if/when this PR could merge? would be nice to have rotation support for long lived toasts...