Create initial Display class

[taylorcjensen]

Create the initial Display class for displaying the Map (#5 & #6).

• [x] Display(Map m)
• [x] public void redraw()
• [x] public int colorValue(Double value, Double min, Double max)

[taylorcjensen]

Updated to create visual map. Need to finish #13 to to connect the flood event and see changes live