Imgscalr Implementation

This update implements the external library “imgscalr” to handle scaling the images displayed in the DisplayPane on the right side of the screen. Try resizing the pane or resizing the program window! At the moment, the DisplayPane shows “MonaLisa.jpg” by default. You will need to change the path to MonaLisa.jpg in DisplayPane.java to whatever the absolute path is to that file on your computer in order to get the program to read it. Otherwise, instead of displaying the picture, the DisplayPane will display an error message.