Getting Resize Event Emit in pixel

[shishirraven]

Great component,
Loved it, but I am facing one slight issue the event of resize is in percentage.

This is useful when we are using a Responsive layout, it would actually help manage the inner View.
Please suggest if there is way to get the size in pixel.

[shishirraven]

Added a pull request to add the functionality.
#150

[shishirraven]

#150