Made a number of minor fixes (be gentle, sorry if stepped all over stuff, but the functionality's quite similar!)

SERVER:
The 'creature' is now contained in an object, and has suitable creature
methods relating to health.
The server now sends hits along with all status updates.
The server now clears the hits list when a status update is sent [NEEDS WORK].
Moved some functions around for better flow.
CLIENT:
The client no longer emits double-hits for each hit; the client will not
display a hit without an update from the server.