Branch/tdg units

@eric79 @youngca 
Here's the first pass of getting unit icons so that they can be added to the map.
insertableUnits: { "ground": [ "INF", "INFFV", "ARMINF", "MORT", "FLDART", "PAA", "AT", "ATG", "TANK", "MECH", "WHMECH", "HMG", "LMG" ] }

The outer most for loop, goes through the 'area' ( ground, sea,... ).  The middle iterates through though the array defined in the 'area'.  The findAll generates an array of all of the matching items in that area, which in turn need to be iterated through.

Does that help?