Merge pull request #314 from barakugav/arraylist-iterator-back

ArrayList iterator back() bug fix, compute remaining correctly

drv/ArrayList.drv

@@ -1001,7 +1001,7 @@ public class ARRAY_LIST KEY_GENERIC extends ABSTRACT_LIST KEY_GENERIC implements
 				@Override
 				public int back(int n) {
 					if (n < 0) throw new IllegalArgumentException("Argument must be nonnegative: " + n);
-					final int remaining = size - pos;
+					final int remaining = pos;
 					if (n < remaining) {
 						pos -= n;
 					} else {