Now sending the grid of tiles corresponding to the actual map loaded by the game engine. Also sending the bounds of the session map (where we can play) and the tiles map (what we have to load for display purposes) to the client, along with the grid of tiles urls
Merge branch 'master' of github.com:tdubourg/geobombing
Merge branch 'master' of https://github.com/tdubourg/geobombing

Conflicts:
	server/tiles.js
Coordinate fixes => makes the client crash...