Brian bashark m5

Added concurrent games that can be accessed from different machines. Added grid drawing with a pointer.

TODO after 5pm: 
-add a "catchup" page if the user updates a game that has already moved beyond their page (currently just sends to index.html).
-create a new pointer, and add text labels to the grid.
-end conditions (already done???). trivial.
-general testing/bugfixing.