implemented feedback given by Taar at http://www.reddit.com/r/learnpython/comments/2m2tjj/codereview_jpglitch_a_jpeg_glitching_script/
implemented feedback given by Taar at http://www.reddit.com/r/learnpython/comments/2m2tjj/codereview_jpglitch_a_jpeg_glitching_script/

dattasaurabh82/jpglitch,Kareeeeem/jpglitch