Added a sql file to this project so that we can track changes to the database as well as changes to the code. See: lygos.sql

Database changes:
1) Renamed `ships` table to `fleet_ships` so that its corresponding php class name would not conflict with the already-planned parent Ship.php class.
2) Moved objective fields from the `traveling_fleets` table to `fleets` since the mission persists in the case of "hold position".
3) Added `home_x_coord` and `home_y_coord` fields to the `fleets` table so that a fleet can return home even if it is sent to multiple places first.
4) Also in the `fleets` table, I changed the `x_coord` and `y_coord` fields to `current_x_coord` and `current_y_coord` respectively.

Added new class files for the `fleets`, `traveling_fleets`, and `fleet_ships` named Fleet.php, Traveling_Fleet.php, and Fleet_Ship.php respectively.

Drafted a file to handle dispatching fleets to places to do things *waves hands vaguely*. See: /ajax/scripts/dispatch_fleet.php. It's untested at the moment because it relies on ship functionality that is not in place yet.