Added a Map.attrs(x, y, k, v) method to store various attributes on the map at x, y in a key 'k'. If 'v' is given it sets it otherwise it gets it. Actor:randomTeleport() wont teleport to places with the no_teleport flag set


git-svn-id: http://svn.net-core.org/repos/t-engine4@1005 51575b47-30f0-44d4-a5cc-537603b46e54