Image Resize Class: Resize image from files in different formats

This package is meant to resize images of different formats. Currently, the supported formats are JPEG and PNG.

The package is based on factory design pattern. There is a ImageResize base class and subclasses for specific image file formats.The ImageResizeFactory class has a factory method which is used to determine which of the sub-classes specialized in each of the supported formats is to be instanciated. The choice of sub-class is made upon the determination of the input image file format from its file name extension.