Merging timer capabilities into master

1. Added StopWatch class in. This is the timer we use to tell how efficient the wolves are. 

2. Modified RancherGame to start the timer when the hunt button is
pushed, and to stop the timer once all the sheep are dead.

3. Right now the timer just throws the time in seconds, or something, so
I still need to parse it correctly.

4. We also need to bring it into the GUI so it doesn't show on just the
console. Should be easy enough, just another text box that will be
repainted along with the game board.