workingAnimal area changed to 1 column

Made the workingAnimal area only have 1 large column, as opposed to
three columns that each use 33% of the space.
Animals change from New to Working

Animals now change from newAnimal to workingAnimal when dragged into the
workingArea. They also increase in size (to fit the workingArea) and are
renamed to a temporary name 'Animal '+indexNumber, where indexNumber is
the animal object's position in the animalObjectArray. The animal's DOM
node also is given an ID with their index number.