Major Description
Splitting off the Color UI portion of the parent UI improvements task, description copied below:
Fill some of the cells with color in order to make it easier to absorb the info, e.g.
RED if Failed Tasks greater than 0 (maybe the more failed, the more intense the red)
GREEN if Active Tasks greater than 0 (maybe more intense the larger the number)
Possibly color code COMPLETE TASKS using various shades of blue (e.g., based on the log(# completed)
if dark blue then write the value in white (same for the RED and GREEN above
Merging another idea from SPARK-2132:
Color GC time red when over a percentage of task time
