Season's Beanings!  More alternate base colors.

The color of Team A and Team B's bases and troops are now
month-dependant, based off the season's sort of colors.  For example,
December has red/green since Christmas colors are usually red and green,
October has orange/purple since Halloween has orange and purple as it's
theme colors, etc.  Haven't picked out colors for everything yet,
though!  Some months use orange/lime as a generic teamset.