pr2014.5.19.1558

1)   Removed redundant variable 'counter' in game.world
2)   Changed variable 'rowString' to 'gridRowAssembly' to reduce ambiguity
3)   Changed variable 'constructor' to 'rowConstructor' to reduce ambiguity
4)   Added game.world.biome which will control all the functions that inject HTML 5 data
     into each grid tile so that biomes can be generated.  These functions will be implemented 
     later.