MAPREDUCE-4678. Running the Pentomino example with defaults throws java.lang.NegativeArraySizeException. Contributed by Chris McConnell. (harsh)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1433412 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-4925. The pentomino option parser may be buggy. Contributed by Karthik Kambatla. (harsh)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1433416 13f79535-47bb-0310-9956-ffa450edef68