Resizes existing popup.
resize(width, height, [callBack])

width | int, new width for the popup
height | int, new height for the popup
callBack | function, call back function on finish

#### Description

This method will resize existing popup to the new dimensions. You could have transition to the new dimensions (and/or context) with w2popup.open, which would have trigger the onOpen event.
To resize popup: w2popup.resize(300, 100);