Added 2 assignments: image processing & WebCrawler

The are two programs I co-authored, written in java.  The first,
ImageProcessing.java, does command-line image processing (grayscale,
rotate left 90 degrees, flip vertically and flip horizontally) and the
latter is a web spider which crawls a page you choose for a phrase of
your choice.  More run-time details will be added to the javadoc
comments in the files.