Screen Capture

Function to capture the screen, or portions of the screen. Uses java.awt.robot screen capture.

Based on this excellent screencapture script by Saurabh Kumar: http://www.mathworks.com/matlabcentral/fileexchange/11363-screencapture

Added a function wrapper to make it more convenient, also added options to be able to capture subregions instead of the full screen, and data can be returned as a Matlab image rather than just a file.

Jan Simon noted this implementation by Yair Altman which has many more options:
http://www.mathworks.com/matlabcentral/fileexchange/24323-screencapture-get-a-screen-capture-of-a-figure-frame-or-component