Fixed version number on Game.

Added generic Command structure with generic commands.

Added string extension. Mostly just for the getWord() function.

Added automatic unloading of obj.* packages. Still have to unload the
singletons yourself.
Made the hotboot phase a little more intelligible. The hotboot is now split into 3 distinct phases.

1) Game.hotboot() initiates a hotboot.
2) main.lua's game loop processes the hotboot.
 2a) First, relevant player data is preserved in the preservedData table.
 2b) Second, all of the game packages are unloaded, allowing for them to be reloaded.
 2c) Third, all of the game packages are reloaded.
 2d) Game is re-opened on the preserved Server.
3) Game.recoverFromHotboot() handles reconnecting Players from the preservedData table.

Clients no longer send option negotiations right away for supported options
on creation. Instead, the second argument to Client:initialize() determines
if this should be done. This is to prevent the same negotiation from being
requested on an already negotiated option after, say, a hotboot, where
clients have to be recreated using the sockets of the old clients.

Commands are no longer documented as packages.
Comments were a bit misleading.