Fixed some errors

-Changed mapaPruebaXml: null pointer  exception there was throw upgrade,
not invisible upgrade.
-Reverted users name code
-Commented "int numPlayers = params.getInt("numPlayers");" in smartfox
server class, i can't connect to server with this (i don't know if you
modified your server and i need modify too)
-Added new image in pack (another null pointer exception with this)