Substantial refactoring to implement correct Naive, UCT Monte Carlo tree search methods.

Removed unnecessary distinction between policy and tree search (tree search is a special kind of policy).
Calculation of all valid moves / arbitrary sets of moves is now a seperate class, as it serves a different purpose than a policy.
Introduced regression error in AlphaBeta test.

test/net/woodyfolsom/msproj/policy/AlphaBetaTest.java

@@ -0,0 +1,57 @@
+package net.woodyfolsom.msproj.policy;
+
+import static org.junit.Assert.assertEquals;
+
+import net.woodyfolsom.msproj.GameBoard;
+import net.woodyfolsom.msproj.GameConfig;
+import net.woodyfolsom.msproj.GameState;
+import net.woodyfolsom.msproj.policy.AlphaBeta;
+import net.woodyfolsom.msproj.policy.Policy;
+
+import org.junit.Test;
+
+public class AlphaBetaTest {
+	@Test
+	public void testGenmoveAsW() {
+		Policy treeSearch = new AlphaBeta();
+		GameState gameState = new GameState(6);
+		gameState.playStone('A', 2, GameBoard.WHITE_STONE);
+		gameState.playStone('B', 1, GameBoard.WHITE_STONE);
+		gameState.playStone('C', 2, GameBoard.WHITE_STONE);
+		gameState.playStone('B', 2, GameBoard.BLACK_STONE);
+
+		String move = treeSearch.getAction(new GameConfig(), gameState, "b");
+		System.out.println(gameState);
+
+		System.out.println("Generated move: " + move);
+		assertEquals("Expected B3 but was: " + move, "B3", move);
+		gameState.playStone("b", move);
+
+		System.out.println(gameState);
+
+		assertEquals(Policy.PASS,
+				treeSearch.getAction(new GameConfig(), gameState, "?"));
+	}
+
+	@Test
+	public void testGenmoveAsB() {
+		Policy treeSearch = new AlphaBeta();
+		GameState gameState = new GameState(6);
+		gameState.playStone('A', 2, GameBoard.BLACK_STONE);
+		gameState.playStone('B', 1, GameBoard.BLACK_STONE);
+		gameState.playStone('C', 2, GameBoard.BLACK_STONE);
+		gameState.playStone('B', 2, GameBoard.WHITE_STONE);
+
+		String move = treeSearch.getAction(new GameConfig(), gameState, "b");
+		System.out.println(gameState);
+
+		System.out.println("Generated move: " + move);
+		assertEquals("Expected B3 but was: " + move, "B3", move);
+		gameState.playStone("b", move);
+
+		System.out.println(gameState);
+
+		assertEquals(Policy.PASS,
+				treeSearch.getAction(new GameConfig(), gameState, "?"));
+	}
+}