[REEF-83]: maven-javadoc-plugin breaks mvn -Papache-release
[REEF-83]: maven-javadoc-plugin breaks mvn -Papache-release

This addressed the issue by updating the version of maven-javadoc-plugin
to 2.10.1.

JIRA: [REEF-83](https://issues.apache.org/jira/browse/REEF-83)

Pull Request: Closes #45

Author:    Byung-Gon Chun <6b8094f8f1cfe663482b0b2c4681f03741d1d32b@apache.org>

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