negamax
negamax with mutable state
Merge branch 'master' of github.com:thurn/uct-java

Conflicts:
	src/ca/thurn/uct/algorithm/NegamaxSearch.java
	src/ca/thurn/uct/algorithm/State.java
	src/ca/thurn/uct/algorithm/UctSearch.java
	src/ca/thurn/uct/connect4/Connect4Main.java
	src/ca/thurn/uct/connect4/Connect4State.java