HADOOP-10333. Fix grammatical error in overview.html document. Contributed by René Nyffenegger.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1566709 13f79535-47bb-0310-9956-ffa450edef68
YARN-1637. Implemented a client library for Java users to post timeline entities and events. Contributed by Zhijie Shen.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1566752 13f79535-47bb-0310-9956-ffa450edef68