clean up dependencies in liferay-doc-utils.jar; extracted commons-io-2.0.1.jar from liferay-doc-utils.jar, added it to liferay-docs/lib and modified build.xml so that liferay-doc-util.jar's manifest declares the dependency
Merge pull request #395 from jrao/LRDOCS-416

Cleaned up dependencies in liferay-doc-utils.jar