Added more image data

Increased the number of sample images for each artist to 10. Added
additional test images to be able to check  accuracy better.
Color Analysis Improvement

while working on what i thought was a new metric of measure, i
determined that it was only a better way to analyze color. Also added a
method to find the average value of all columns
Bugs

Fixed a bug where the average column was not properly displaying. Am
still unable to determine why the second column is calculated
incorrectly.