MAPREDUCE 5874. Creating MapReduce REST API section. Contributed by Tsuyoshi Ozawa

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1595268 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5809. Merging change r1595283 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1595290 13f79535-47bb-0310-9956-ffa450edef68