updating Marble game; changed marble mesh (now it looks like a marble), added city data DB and some preliminary integration with worldGen
final changes before SxSWi (good luck!!)
Merge commit 'bb56d56395a436b8f1ebed9ad1a8f3c1063a2b2f' into robert
Merge pull request #2 from patriciogonzalezvivo/robert

Robert