Adds code to get the Scala REPL working

classpath/java/math/BigInteger.java

@@ -0,0 +1,44 @@
+/* Copyright (c) 2013, Avian Contributors
+
+   Permission to use, copy, modify, and/or distribute this software
+   for any purpose with or without fee is hereby granted, provided
+   that the above copyright notice and this permission notice appear
+   in all copies.
+
+   There is NO WARRANTY for this software.  See license.txt for
+   details. */
+
+package java.math;
+
+import java.io.Serializable;
+
+public class BigInteger implements Serializable {
+
+  private int   sign;
+  private int[] value;
+
+  private BigInteger(int sign, long value) {
+    this.sign = sign;
+    int upperBits = (int) (value >>> 32);
+    if (upperBits == 0)
+      // Array with one element
+      this.value = new int[] { (int) value };
+    else
+      // Array with two elements
+      this.value = new int[] { (int) value, upperBits };
+  }
+
+  public static final BigInteger ZERO = new BigInteger(0,  0);
+  public static final BigInteger ONE  = new BigInteger(1,  1);
+  public static final BigInteger TEN  = new BigInteger(1, 10);
+
+  public static BigInteger valueOf(long num) {
+    int signum = Long.signum(num);
+    if (signum == 0)
+      return BigInteger.ZERO;
+    else if (signum > 0)
+      return new BigInteger(signum, num);
+    else
+      return new BigInteger(signum, -num);   
+  }
+}