error_level_difference(string, int, int, int)
 filename: Filename of the image
 iterations: Number of iterations to run ELD.
 qualityV: Starting quality value. Diminishes over each iteration
 scale: Scales the pixel values. Makes differing artifacts easier to see.
 
 ACKNOWLEDGEMENTS: 
                   Hany Farid, for his papers and 
                   research on digital forensics.

                   Sungjoo Ha (shurain), for his 
                   starting code on ELA.
 
 
Photo credit: http://imgur.com/user/ANewBadlyPhotoshoppedPhotoofMichaelCeraEveryday